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- Table of Contents
-
- 11-Layer 3—IP Services Command Reference
- 00-Preface
- 01-ARP commands
- 02-IP addressing commands
- 03-DHCP commands
- 04-DNS commands
- 05-IP forwarding basics commands
- 06-Fast forwarding commands
- 07-Multi-CPU packet distribution commands
- 08-Adjacency table commands
- 09-IP performance optimization commands
- 10-IPv6 basics commands
- 11-DHCPv6 commands
- 12-IPv6 fast forwarding commands
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 04-DNS commands | 182.23 KB |
DNS commands
display dns domain
Use display dns domain to display the domain name suffixes.
Syntax
display dns domain [ dynamic ] [ vpn-instance vpn-instance-name ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
dynamic: Displays the domain name suffixes dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays the statically configured and dynamically obtained domain name suffixes.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays domain name suffixes for the public network.
Examples
# Display the statically configured and dynamically obtained domain name suffixes for the public network.
<Sysname> display dns domain
Type:
D: Dynamic S: Static
No. Type Domain suffix
1 S com
Table 1 Command output
|
Field |
Description |
|
No. |
Sequence number. |
|
Type |
Domain name suffix type: · S—A statically configured domain name suffix. · D—A domain name suffix dynamically obtained through DHCP or other protocols. |
|
Domain suffix |
Domain name suffixes. |
dns domain
display dns host
Use display dns host to display information about domain name-to-IP address mappings.
Syntax
display dns host [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
ip: Specifies type A queries. A type A query resolves a domain name to the mapped IPv4 address.
ipv6: Specifies type AAAA queries. A type AAAA query resolves a domain name to the mapped IPv6 address.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays domain name-to-IP address mappings for the public network.
Usage guidelines
If you do not specify the ip or ipv6 keyword, this command displays domain name-to-IP address mappings of all query types.
Examples
# Display domain name-to-IP address mappings of all query types.
<Sysname> display dns host
Type:
D: Dynamic S: Static
Total number: 3
No. Host name Type TTL Query type IP addresses
1 sample.com D 3132 A 192.168.10.1
192.168.10.2
192.168.10.3
2 zig.sample.com S - A 192.168.1.1
3 sample.net S - AAAA FE80::4904:4448
Table 2 Command output
|
Field |
Description |
|
|
No. |
Sequence number. |
|
|
Host name |
Domain name. |
|
|
Type |
Domain name-to-IP address mapping type: · S—A static mapping configured by the ip host or ipv6 host command. · D—A mapping dynamically obtained through dynamic domain name resolution. |
|
|
TTL |
Time in seconds that a mapping can be stored in the cache. For a static mapping, a hyphen (-) is displayed. |
|
|
Query type |
Query type: A and AAAA. |
|
|
IP addresses |
Replied IP address: · For a type A query, the replied IP address is an IPv4 address. · For a type AAAA query, the replied IP address is an IPv6 address. |
|
ip host
ipv6 host
reset dns host
display dns server
Use display dns server to display IPv4 DNS server information.
Syntax
display dns server [ dynamic ] [ vpn-instance vpn-instance-name ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
dynamic: Displays IPv4 DNS server information dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays statically configured and dynamically obtained IPv4 DNS server information.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays IPv4 DNS server information for the public network.
Examples
# Display IPv4 DNS server information for the public network.
<Sysname> display dns server
Type:
D: Dynamic S: Static
No. Type IP address
1 S 202.114.0.124
2 S 169.254.65.125
Table 3 Command output
|
Field |
Description |
|
No. |
Sequence number. |
|
Type |
DNS server type: · S—A manually configured DNS server. · D—DNS server information dynamically obtained through DHCP or other protocols. |
|
IP address |
IPv4 address of the DNS server. |
Related commands
dns server
display ipv6 dns server
Use display ipv6 dns server to display IPv6 DNS server information.
Syntax
display ipv6 dns server [ dynamic ] [ vpn-instance vpn-instance-name ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
dynamic: Displays IPv6 DNS server information dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays the statically configured and dynamically obtained IPv6 DNS server information.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays IPv6 DNS server information for the public network.
Examples
# Display IPv6 DNS server information for the public network.
<Sysname> display ipv6 dns server
Type:
D: Dynamic S: Static
No. Type IPv6 address Outgoing Interface
1 S 2::2
Table 4 Command output
|
Field |
Description |
|
No. |
Sequence number. |
|
Type |
DNS server type: · S—A manually configured DNS server. · D—DNS server information dynamically obtained through DHCP or other protocols. |
|
IPv6 address |
IPv6 address of the DNS server. |
|
Outgoing Interface |
Output interface. |
Related commands
ipv6 dns server
dns domain
Use dns domain to configure a domain name suffix.
Use undo dns domain to delete the specified domain name suffix.
Syntax
dns domain domain-name [ vpn-instance vpn-instance-name ]
undo dns domain domain-name [ vpn-instance vpn-instance-name ]
Default
No domain name suffix is configured. Only the provided domain name is resolved.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
domain-name: Specifies a domain name suffix. It is a dot-separated, case-insensitive string that can include letters, digits, hyphens (-), underscores (_), and dots (.), for example, aabbcc.com. The domain name suffix can include a maximum of 253 characters, and each separated string includes no more than 63 characters.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To configure a domain name suffix for the public network, do not specify this option.
Usage guidelines
For domain name resolution, the resolver automatically uses the suffix list to supply the missing part of an incomplete name entered by a user.
A domain name suffix applies to both IPv4 DNS and IPv6 DNS.
The system allows a maximum of 16 domain name suffixes for the public network or each VPN instance. You can specify domain name suffixes for both public network and VPN instances.
Examples
# Configure domain name suffix com for the public network.
<Sysname> system-view
[Sysname] dns domain com
Related commands
display dns domain
dns dscp
Use dns dscp to set the DSCP value for DNS packets sent by a DNS client or DNS proxy.
Use undo dns dscp to restore the default.
Syntax
dns dscp dscp-value
undo dns dscp
Default
The DSCP value is 0 in DNS packets sent by a DNS client or DNS proxy.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
dscp-value: Specifies the DSCP value in the range of 0 to 63.
Usage guidelines
The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.
Examples
# Set the DSCP value to 30 for outgoing DNS packets.
<Sysname> system-view
[Sysname] dns dscp 30
dns filter
Use dns filter to enable DNS filtering and add a host name to the denylist or allowlist.
Use undo dns filter to disable DNS filtering and delete a host name from the denylist or allowlist.
Syntax
dns filter { allowlist | denylist } hostname
undo dns filter { allowlist | denylist } hostname
The following compatibility matrix shows the support of hardware platforms for this command:
|
Hardware platform |
Module type |
Command compatibility |
|
M9006 M9010 M9014 |
Blade 4 firewall module |
Yes |
|
Blade 5 firewall module |
Yes |
|
|
NAT module |
Yes |
|
|
M9010-GM |
Encryption module |
Yes |
|
M9016-V |
Blade 5 firewall module |
Yes |
|
M9008-S M9012-S |
Blade 4 firewall module |
Yes |
|
Intrusion prevention service (IPS) module |
Yes |
|
|
Video network gateway module |
Yes |
|
|
M9008-S-6GW |
IPv6 module |
Yes |
|
M9008-S-V |
Blade 4 firewall module |
Yes |
|
M9000-AI-E4 |
Blade 5 firewall module |
No |
|
M9000-AI-E8 M9000-AI-E16 |
Blade 5 firewall module |
Yes |
|
M9000-X06 M9000-X10 |
Blade 6 firewall module |
Yes |
Default
DNS filtering is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
allowlist: Adds a host name to the allowlist.
denylist: Adds a host name to the denylist.
hostname: Specifies a host name, a case-insensitive string of 1 to 253 characters. The string can contain letters, digits, hyphens (-), underscores (_), and dots (.). This argument supports fuzzy match by adding the character (*) to the start or end of the string. For example, to match a host name including abc, specify the hostname argument as *abc*, *abc, or abc*. To exactly match a host name, do not add the character (*).
Usage guidelines
The DNS proxy uses DNS filtering to filter DNS requests as follows:
· If the allowlist has a matching host name or the denylist does not have any matching host name with the domain name in the received DNS request, the DNS proxy filters in the request. Upon receiving a DNS reply, the DNS proxy records the DNS mapping and forwards the reply to the DNS client.
· If the denylist has a matching host name or the allowlist does not have any matching host name with the domain name in the received DNS request, the DNS proxy discards the DNS request.
To implement a strict access control, use an allowlist to filter DNS requests. To implement a loose access control, use a denylist to filter DNS requests.
To add multiple host names to the allowlist or denylist, repeat this command. However, a host name cannot be added to both the denylist and allowlist.
Examples
# Enable DNS filtering and add the host names containing .abc to the allowlist.
<Sysname> system-view
[Sysname] dns filter allowlist *.abc
dns proxy enable
Use dns proxy enable to enable DNS proxy.
Use undo dns proxy enable to disable DNS proxy.
Syntax
dns proxy enable
undo dns proxy enable
Default
DNS proxy is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
This configuration applies to both IPv4 DNS and IPv6 DNS.
Examples
# Enable DNS proxy.
<Sysname> system-view
[Sysname] dns proxy enable
dns server
Use dns server to specify the IPv4 address of a DNS server.
Use undo dns server to remove the IPv4 address of a DNS server.
Syntax
dns server ip-address [ vpn-instance vpn-instance-name ]
undo dns server [ ip-address ] [ vpn-instance vpn-instance-name ]
Default
No DNS server IPv4 address is specified.
Views
System view
Interface view
Predefined user roles
network-admin
context-admin
Parameters
ip-address: Specifies the IPv4 address of a DNS server. When you execute the undo form of the command in interface view, you must specify this argument.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a DNS server IPv4 address for the public network, do not use this option.
Usage guidelines
The device sends a DNS query request to the DNS servers in the order their IPv4 addresses are specified.
The system allows a maximum of six DNS server IPv4 addresses for the public network or each VPN instance. You can specify DNS server IPv4 addresses for both public network and VPN instances.
If you do not specify an IPv4 address, the undo dns server command removes all DNS server IPv4 addresses for the public network or the specified VPN instance.
Examples
# Specify DNS server IPv4 address 172.16.1.1.
<Sysname> system-view
[Sysname] dns server 172.16.1.1
# Specify DNS server IPv4 address 172.16.1.1 on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] dns server 172.16.1.1
Related commands
display dns server
dns snooping enable
Use dns snooping enable to enable DNS snooping.
Use undo dns snooping enable to disable DNS snooping.
Syntax
dns snooping enable
undo dns snooping enable
Default
DNS snooping is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
DNS snooping is applicable to scenarios that use domain name-based policies (such as security policies and bandwidth policies). In such a scenario, the device requires the resolved IP addresses for traffic filtering. Enabled with DNS snooping, the device monitors received DNS requests and replies, and works as follows:
· If the domain name in a DNS request matches a policy, the device records the DNS mapping after receiving the DNS reply, and reports the mapping to the policy for traffic filtering.
· If the domain name does not match a policy, the device does not record the DNS mapping.
DNS snooping works only between the DNS client and DNS server, or the DNS client and DNS proxy.
The DNS snooping and DNS transparent proxy features cannot be both configured.
Examples
# Enable DNS snooping.
<Sysname> system-view
[Sysname] dns snooping enable
Related commands
dns transparent-proxy enable
dns snooping log enable
Use dns snooping log enable to enable DNS snooping logging.
Use undo dns snooping log enable to disable DNS snooping logging.
Syntax
dns snooping log enable
undo dns snooping log enable
The following compatibility matrix shows the support of hardware platforms for this command:
|
Hardware platform |
Module type |
Command compatibility |
|
M9006 M9010 M9014 |
Blade 4 firewall module |
Yes |
|
Blade 5 firewall module |
Yes |
|
|
NAT module |
Yes |
|
|
M9010-GM |
Encryption module |
Yes |
|
M9016-V |
Blade 5 firewall module |
Yes |
|
M9008-S M9012-S |
Blade 4 firewall module |
Yes |
|
Intrusion prevention service (IPS) module |
Yes |
|
|
Video network gateway module |
Yes |
|
|
M9008-S-6GW |
IPv6 module |
Yes |
|
M9008-S-V |
Blade 4 firewall module |
Yes |
|
M9000-AI-E4 |
Blade 5 firewall module |
No |
|
M9000-AI-E8 M9000-AI-E16 |
Blade 5 firewall module |
Yes |
|
M9000-X06 M9000-X10 |
Blade 6 firewall module |
Yes |
Default
DNS snooping logging is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
The DNS proxy searches the static domain name resolution table and dynamic domain name resolution cache after receiving a request.
· If the requested information is found, the DNS proxy returns a DNS reply to the client.
· If the requested information is not found, the DNS proxy sends the request to the designated DNS server.
Too many requests received at the same time will increase network load and affect the performance of the DNS proxy and DNS server.
To avoid this issue, you can configure DNS snooping on the device between the DNS client and DNS proxy, or the DNS client and DNS server. Also, you can configure the device to generate and send DNS snooping logs to the fast log module. The administrator can locate and troubleshoot issues based on the logs. For information about the fast log output function, see Network Management and Monitoring Configuration Guide.
Examples
# Enable DNS snooping logging.
<Sysname> system-view
[Sysname] dns snooping log enable
dns snooping rate-limit
Use dns snooping rate-limit to configure a rate limit for incoming DNS packets on interfaces.
Use undo dns snooping rate-limit to disable DNS snooping packet rate limit.
Syntax
dns snooping rate-limit rate
undo dns snooping rate-limit
The following compatibility matrix shows the support of hardware platforms for this command:
|
Hardware platform |
Module type |
Command compatibility |
|
M9006 M9010 M9014 |
Blade 4 firewall module |
Yes |
|
Blade 5 firewall module |
Yes |
|
|
NAT module |
Yes |
|
|
M9010-GM |
Encryption module |
Yes |
|
M9016-V |
Blade 5 firewall module |
Yes |
|
M9008-S M9012-S |
Blade 4 firewall module |
Yes |
|
Intrusion prevention service (IPS) module |
Yes |
|
|
Video network gateway module |
Yes |
|
|
M9008-S-6GW |
IPv6 module |
Yes |
|
M9008-S-V |
Blade 4 firewall module |
Yes |
|
M9000-AI-E4 |
Blade 5 firewall module |
No |
|
M9000-AI-E8 M9000-AI-E16 |
Blade 5 firewall module |
Yes |
|
M9000-X06 M9000-X10 |
Blade 6 firewall module |
Yes |
Default
The rate of incoming DNS packets is not limited.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
rate: Specifies the maximum rate in pps. The value range for the rate argument is 64 to 512.Usage guidelines
An interface will discard DNS packets exceeding the specified rate limit.
This command takes effect only when the DNS transparent proxy or DNS snooping logging feature is enabled.
Examples
# Set the DNS packet rate limit to 64 pps.
<Sysname> system-view
[Sysname] dns snooping rate-limit 64
Related commands
dns snooping log enable
dns transparent-proxy enable
dns source-interface
Use dns source-interface to specify the source interface for DNS packets.
Use undo dns source-interface to restore the default.
Syntax
dns source-interface interface-type interface-number [ vpn-instance vpn-instance-name ]
undo dns source-interface interface-type interface-number [ vpn-instance vpn-instance-name ]
Default
No source interface is specified for DNS packets. The device uses the primary IP address of the output interface of the matching route as the source IP address for a DNS request.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
interface-type interface-number: Specifies an interface by its type and number.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a source interface for the public network, do not use this option.
Usage guidelines
This configuration applies to both IPv4 and IPv6.
In IPv4 DNS, the device uses the primary IPv4 address of the specified source interface as the source IP address of a DNS query. In IPv6 DNS, the device selects an IPv6 address of the specified source interface as the source IP address of a DNS query. The method of selecting the IPv6 address is defined in RFC 3484.
The system allows only one source interface for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can specify source interfaces for both public network and VPN instances.
This command takes effect whether the source interface belongs to the VPN instance or not. As a best practice, specify an interface that belongs to the VPN instance as the source interface.
Examples
# Specify GigabitEthernet 1/0/1 as the source interface for DNS packets on the public network.
<Sysname> system-view
[Sysname] dns source-interface gigabitethernet 1/0/1
dns spoofing
Use dns spoofing to enable DNS spoofing and specify the IPv4 address for spoofing DNS requests.
Use undo dns spoofing to disable DNS spoofing.
Syntax
dns spoofing ip-address [ vpn-instance vpn-instance-name ]
undo dns spoofing ip-address [ vpn-instance vpn-instance-name ]
Default
DNS spoofing is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
ip-address: Specifies the IPv4 address used to spoof DNS requests.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To enable DNS spoofing for the public network, do not specify this option.
Usage guidelines
Use the dns spoofing command together with the dns proxy enable command.
DNS spoofing functions when the DNS proxy does not know the DNS server address or cannot reach the DNS server. It enables the DNS proxy to spoof DNS queries of type A by responding with the specified IPv4 address.
The system allows only one replied IPv4 address for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can configure DNS spoofing for both public network and VPN instances.
Examples
# Enable DNS spoofing for the public network and specify IPv4 address 1.1.1.1 for spoofing DNS requests.
<Sysname> system-view
[Sysname] dns proxy enable
[Sysname] dns spoofing 1.1.1.1
Related commands
dns proxy enable
dns transparent-proxy enable
Use dns transparent-proxy enable to enable DNS transparent proxy.
Use undo dns transparent-proxy enable to disable DNS transparent proxy.
Syntax
dns transparent-proxy enable
undo dns transparent-proxy enable
The following compatibility matrix shows the support of hardware platforms for this command:
|
Hardware platform |
Module type |
Command compatibility |
|
M9006 M9010 M9014 |
Blade 4 firewall module |
Yes |
|
Blade 5 firewall module |
Yes |
|
|
NAT module |
Yes |
|
|
M9010-GM |
Encryption module |
Yes |
|
M9016-V |
Blade 5 firewall module |
Yes |
|
M9008-S M9012-S |
Blade 4 firewall module |
Yes |
|
Intrusion prevention service (IPS) module |
Yes |
|
|
Video network gateway module |
Yes |
|
|
M9008-S-6GW |
IPv6 module |
Yes |
|
M9008-S-V |
Blade 4 firewall module |
Yes |
|
M9000-AI-E4 |
Blade 5 firewall module |
No |
|
M9000-AI-E8 M9000-AI-E16 |
Blade 5 firewall module |
Yes |
|
M9000-X06 M9000-X10 |
Blade 6 firewall module |
Yes |
Default
DNS transparent proxy is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
DNS transparent proxy modifies the source address in the DNS request so that the DNS client seems to receive a DNS reply directly from the DNS server. This feature is applicable to domain name-based policies, such as security policies and bandwidth policies.
The DNS client does not configure the DNS server address as the DNS transparent proxy address, which simplifies the DNS client configuration. As a best practice, enable DNS transparent proxy in some load balancing scenarios.
The device enabled with DNS transparent proxy monitors received DNS requests and replies and records DNS mappings as follows:
1. The device monitors all received DNS packets. Upon receiving a DNS request, the device specifies a local IP address that can reach the DNS server as the source IP address for the request.
2. Upon receiving the DNS reply, the device records the DNS mapping and forwards the reply to the DNS client.
3. The device searches the local entries after receiving another request. If a match is found, the device returns a DNS reply to the client. If no match is found, the device forwards the query to the DNS server for domain name resolution.
The DNS transparent proxy and DNS snooping features cannot be both configured.
Examples
# Enable DNS transparent proxy.
<Sysname> system-view
[Sysname] dns transparent-proxy enable
Related commands
dns proxy enable
dns snooping enable
dns trust-interface
Use dns trust-interface to specify a DNS trusted interface.
Use undo dns trust-interface to remove a DNS trusted interface.
Syntax
dns trust-interface interface-type interface-number
undo dns trust-interface [ interface-type interface-number ]
Default
No DNS trusted interface is specified.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
interface-type interface-number: Specifies an interface by its type and number.
Usage guidelines
By default, an interface obtains DNS suffix and DNS server information from DHCP. A network attacker might act as the DHCP server to assign a wrong DNS suffix and DNS server address to the device. As a result, the device fails to obtain the resolved IP address or might get the wrong IP address. With the DNS trusted interface specified, the device only uses the DNS suffix and DNS server information obtained through the trusted interface to avoid attacks.
This configuration applies to both IPv4 DNS and IPv6 DNS.
You can configure a maximum of 128 DNS trusted interfaces on the device.
If you do not specify an interface, the undo dns trust-interface command removes all DNS trusted interfaces and restores the default.
Examples
# Specify GigabitEthernet 1/0/1 as a DNS trusted interface.
<Sysname> system-view
[Sysname] dns trust-interface gigabitethernet 1/0/1
ip host
Use ip host to create a host name-to-IPv4 address mapping.
Use undo ip host to remove a host name-to-IPv4 address mapping.
Syntax
ip host host-name ip-address [ vpn-instance vpn-instance-name ]
undo ip host host-name ip-address [ vpn-instance vpn-instance-name ]
Default
No host name-to-IPv4 address mappings exist.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
host-name: Specifies a host name, a case-insensitive string of 1 to 253 characters. Valid characters are letters, digits, hyphens (-), underscores (_), and dots (.).
ip-address: Specifies the IPv4 address of the host.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To create a host name-to-IP address mapping for the public network, do not specify this option.
Usage guidelines
The system allows a maximum of 1024 host name-to-IPv4 address mappings for the public network or each VPN instance. You can configure host name-to-IPv4 address mappings for both public network and VPN instances.
For the public network or a VPN instance, each host name maps to only one IPv4 address. If you execute this command multiple times, the most recent configuration takes effect.
Do not use the ping command parameter ip, -a, -c, -f, -h, -i, -m, -n, -p, -q, -r, -s, -t, -tos, -v, or -vpn-instance as the host name. For more information about the ping command parameters, see Network Management and Monitoring Command Reference.
Examples
# Map IPv4 address 10.110.0.1 to host name aaa for the public network.
<Sysname> system-view
[Sysname] ip host aaa 10.110.0.1
display dns host
ipv6 dns dscp
Use ipv6 dns dscp to set the DSCP value for IPv6 DNS packets sent by an IPv6 DNS client or IPv6 DNS proxy.
Use undo ipv6 dns dscp to restore the default.
Syntax
ipv6 dns dscp dscp-value
undo ipv6 dns dscp
Default
The DSCP value is 0 in IPv6 DNS packets sent by an IPv6 DNS client or IPv6 DNS proxy.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
dscp-value: Specifies the DSCP value in the range of 0 to 63.
Usage guidelines
The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.
Examples
# Set the DSCP value to 30 for outgoing IPv6 DNS packets.
<Sysname> system-view
[Sysname] ipv6 dns dscp 30
ipv6 dns server
Use ipv6 dns server to specify the IPv6 address of a DNS server.
Use undo ipv6 dns server to remove the IPv6 address of a DNS server.
Syntax
ipv6 dns server ipv6-address [ interface-type interface-number ] [ vpn-instance vpn-instance-name ]
undo ipv6 dns server [ ipv6-address [ interface-type interface-number ] ] [ vpn-instance vpn-instance-name ]
Default
No DNS server IPv6 address is specified.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
ipv6-address: Specifies the IPv6 address of a DNS server.
interface-type interface-number: Specifies the output interface by its type and number. If you do not specify an interface, the device forwards DNS packets out of the output interface of the matching route. Specify this argument if the IPv6 address of the DNS server is a link-local address. Do not specify this argument if the IPv6 address of the DNS server is a global unicast address.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a DNS server IPv6 address for the public network, do not use this option.
Usage guidelines
The device sends a DNS query request to the DNS servers in the order their IPv6 addresses are specified.
The system allows a maximum of six DNS server IPv6 addresses for the public network or each VPN instance. You can specify DNS server IPv6 addresses for both public network and VPN instances.
If you do not specify an IPv6 address, the undo ipv6 dns server command removes all DNS server IPv6 addresses for the public network or the specified VPN instance.
Examples
# Specify DNS server IPv6 address 2002::1 for the public network.
<Sysname> system-view
[Sysname] ipv6 dns server 2002::1
Related commands
display ipv6 dns server
ipv6 dns spoofing
Use ipv6 dns spoofing to enable DNS spoofing and specify the IPv6 address to spoof DNS requests.
Use undo ipv6 dns spoofing to disable DNS spoofing.
Syntax
ipv6 dns spoofing ipv6-address [ vpn-instance vpn-instance-name ]
undo ipv6 dns spoofing ipv6-address [ vpn-instance vpn-instance-name ]
Default
DNS spoofing is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
ipv6-address: Specifies the IPv6 address used to spoof DNS requests.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To enable DNS spoofing for the public network, do not specify this option.
Usage guidelines
Use the ipv6 dns spoofing command together with the dns proxy enable command.
DNS spoofing functions when the DNS proxy does not know the DNS server address or cannot reach the DNS server. It enables the DNS proxy to spoof DNS queries of type AAAA by responding with the specified IPv6 address.
The system allows only one replied IPv6 address for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can configure DNS spoofing for both public network and VPN instances.
Examples
# Enable DNS spoofing for the public network and specify IPv6 address 2001::1 for spoofing DNS requests.
<Sysname> system-view
[Sysname] dns proxy enable
[Sysname] ipv6 dns spoofing 2001::1
Related commands
dns proxy enable
ipv6 host
Use ipv6 host to create a host name-to-IPv6 address mapping.
Use undo ipv6 host to remove a host name-to-IPv6 address mapping.
Syntax
ipv6 host host-name ipv6-address [ vpn-instance vpn-instance-name ]
undo ipv6 host host-name ipv6-address [ vpn-instance vpn-instance-name ]
Default
No host name-to-IPv6 address mappings exist.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
host-name: Specifies a host name, a case-insensitive string of 1 to 253 characters. It can include letters, digits, hyphens (-), underscores (_), and dots (.).
ipv6-address: Specifies the IPv6 address of the host.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To create a host name-to-IPv6 address mapping for the public network, do not specify this option.
Usage guidelines
The system allows a maximum of 1024 host name-to-IPv6 address mappings for the public network or each VPN instance. You can configure host name-to-IPv6 address mappings for both public network and VPN instances.
For the public network or a VPN instance, each host name maps to only one IPv6 address. If you execute this command multiple times, the most recent configuration takes effect.
Do not use the ping ipv6 command parameter -a, -c, -i, -m, -q, -s, -t, -tc, -v, or -vpn-instance as the host name. For more information about the ping ipv6 command parameters, see Network Management and Monitoring Command Reference.
Examples
# Map IPv6 address 2001::1 to host name aaa for the public network.
<Sysname> system-view
[Sysname] ipv6 host aaa 2001::1
Related commands
ip host
reset dns host
Use reset dns host to clear dynamic DNS entries.
Syntax
reset dns host [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]
Views
User view
Predefined user roles
network-admin
context-admin
Parameters
ip: Specifies type A queries. A type A query resolves a domain name to the mapped IPv4 address.
ipv6: Specifies type AAAA queries. A type AAAA query resolves a domain name to the mapped IPv6 address.
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command clears dynamic DNS entries for the public network.
Usage guidelines
If you do not specify the ip or ipv6 keyword, the reset dns host command clears dynamic DNS entries of all query types.
Use this command to clear the following dynamic DNS entries:
· Dynamic DNS entries on the DNS client.
· Dynamic DNS entries on the device enabled with DNS transparent proxy.
Examples
# Clear dynamic DNS entries of all query types for the public network.
<Sysname> reset dns host
Related commands
display dns host
reset dns snooping log statistics
Use reset dns snooping log statistics to clear DNS snooping log statistics.
Syntax
reset dns snooping log statistics
The following compatibility matrix shows the support of hardware platforms for this command:
|
Hardware platform |
Module type |
Command compatibility |
|
M9006 M9010 M9014 |
Blade 4 firewall module |
Yes |
|
Blade 5 firewall module |
Yes |
|
|
NAT module |
Yes |
|
|
M9010-GM |
Encryption module |
Yes |
|
M9016-V |
Blade 5 firewall module |
Yes |
|
M9008-S M9012-S |
Blade 4 firewall module |
Yes |
|
Intrusion prevention service (IPS) module |
Yes |
|
|
Video network gateway module |
Yes |
|
|
M9008-S-6GW |
IPv6 module |
Yes |
|
M9008-S-V |
Blade 4 firewall module |
Yes |
|
M9000-AI-E4 |
Blade 5 firewall module |
No |
|
M9000-AI-E8 M9000-AI-E16 |
Blade 5 firewall module |
Yes |
|
M9000-X06 M9000-X10 |
Blade 6 firewall module |
Yes |
Views
User view
Predefined user roles
network-admin
context-admin
Examples
# Clear DNS snooping log statistics.
<Sysname> reset dns snooping log statistics
DDNS commands
ddns apply policy
Use ddns apply policy to apply a DDNS policy to an interface and enable DDNS update. DDNS updates the mapping between the FQDN and the primary IP address of the interface.
Use undo ddns apply policy to remove the application of a DDNS policy from an interface and to stop DDNS update.
Syntax
ddns apply policy policy-name [ fqdn domain-name ]
undo ddns apply policy policy-name
Default
No DDNS policy and FQDN are specified on the interface, and DDNS update is disabled.
Views
Interface view
Predefined user roles
network-admin
context-admin
Parameters
policy-name: Specifies a DDNS policy by its name, a case-insensitive string of 1 to 32 characters.
fqdn domain-name: Specifies the FQDN to replace <h> in the URL for DDNS update. The domain-name argument specifies a case-insensitive string of 1 to 253 characters. It can include letters, digits, hyphens (-), underscores (_), and dots (.).
Usage guidelines
You can apply a maximum of four DDNS policies to an interface.
If you execute this command multiple times with the same DDNS policy name but different FQDNs, both of the following occur:
· The most recent configuration takes effect.
· The device initiates a DDNS update request immediately.
Examples
# Apply DDNS policy steven_policy to GigabitEthernet 1/0/1 to update the domain name-to-IP address mapping for FQDN www.whatever.com and enable DDNS update.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] ddns apply policy steven_policy fqdn www.whatever.com
ddns policy
display ddns policy
ddns dscp
Use ddns dscp to set the DSCP value for outgoing DDNS packets.
Use undo ddns dscp to restore the default.
Syntax
ddns dscp dscp-value
undo ddns dscp
Default
The DSCP value for outgoing DDNS packets is 0.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
dscp-value: Specifies the DSCP value in the range of 0 to 63.
Usage guidelines
The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.
Examples
# Set the DSCP value to 30 for outgoing DDNS packets.
<Sysname> system-view
[Sysname] ddns dscp 30
ddns policy
Use ddns policy to create a DDNS policy and enter its view, or enter the view of an existing DDNS policy.
Use undo ddns policy to delete a DDNS policy.
Syntax
ddns policy policy-name
undo ddns policy policy-name
Default
No DDNS policies exist.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
policy-name: Specifies the DDNS policy name, a case-insensitive string of 1 to 32 characters.
Usage guidelines
You can create a maximum of 16 DDNS policies on the device.
Examples
# Create a DDNS policy named steven_policy and enter its view.
<Sysname> system-view
[Sysname] ddns policy steven_policy
Related commands
ddns apply policy
display ddns policy
Use display ddns policy to display information about DDNS policies.
Syntax
display ddns policy [ policy-name ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
policy-name: Specifies a DDNS policy by its name, a case-insensitive string of 1 to 32 characters. If you do not specify a DDNS policy, this command displays information about all DDNS policies.
Examples
# Display information about DDNS policy steven_policy.
<Sysname> display ddns policy steven_policy
DDNS policy: steven_policy
URL : http://members.3322.org/dyndns/update?
system=dyndns&hostname=<h>&myip=<a>
Username : steven
Password : ******
Method : GET
SSL client policy:
Interval : 1 days 0 hours 1 minutes
# Display information about all DDNS policies.
<Sysname> display ddns policy
DDNS policy: steven_policy
URL : http://members.3322.org/dyndns/update?system=
dyndns&hostname=<h>&myip=<a>
Username : steven
Password : ******
Method : GET
SSL client policy:
Interval : 0 days 0 hours 30 minutes
DDNS policy: tom-policy
URL : http://members.3322.org/dyndns/update?system=
dyndns&hostname=<h>&myip=<a>
Username :
Password :
Method : GET
SSL client policy:
Interval : 0 days 0 hours 15 minutes
DDNS policy: u-policy
URL : oray://phddns60.oray.net
Username : username
Password :
Method : -
SSL client policy:
Interval : 0 days 0 hours 15 minutes
Table 5 Command output
|
Field |
Description |
|
|
DDNS policy |
DDNS policy name. |
|
|
URL |
URL address for a DDNS update request. This field is empty if no URL address is configured. |
|
|
Username |
Username for logging in to the DDNS server. This field is empty if no username is configured. |
|
|
Password |
Password for logging in to the DDNS server. This field is empty if no password is configured and displays ****** if a password is configured. |
|
|
Method |
Parameter transmission method used to send HTTP/HTTPS-based DDNS update requests. Method types include GET and POST. |
|
|
SSL client policy |
Name of the associated SSL client policy. This field is empty if no SSL client policy is associated. |
|
|
Interval |
Interval for sending DDNS update requests. |
|
ddns policy
interval
Use interval to set the interval for sending DDNS update requests.
Use undo interval to restore the default.
Syntax
interval days [ hours [ minutes ] ]
undo interval
Default
The DDNS update request interval is 1 hour.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
days: Days in the range of 0 to 365.
hours: Hours in the range of 0 to 23.
minutes: Minutes in the range of 0 to 59.
Usage guidelines
The interface always sends a DDNS update request in one of the following conditions:
· The primary IP address of the interface changes.
· The link state of the interface changes from down to up.
If you set the interval to 0, the device does not periodically initiate DDNS update requests.
If you execute this command multiple times, the most recent configuration takes effect. If you change the interval for an applied DDNS policy, the device immediately initiates a DDNS update request and sets the interval as the update interval.
Examples
# Set the interval to 1 day and 1 minute for sending DDNS update requests for DDNS policy steven_policy.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] interval 1 0 1
ddns policy
display ddns policy
method
Use method to specify the parameter transmission method for sending DDNS update requests to HTTP/HTTPS-based DDNS servers.
Use undo method to restore the default.
Syntax
method { http-get | http-post }
undo method
Default
The method http-get applies.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
http-get: Uses the get operation.
http-post: Uses the post operation.
Usage guidelines
This command applies to DDNS updates in HTTP/HTTPS. If the DDNS server uses HTTP or HTTPS service, choose a parameter transmission method compatible with the DDNS server. For example, a DHS server supports the http-post method.
If the DDNS policy has been applied to an interface, a DDNS update is sent immediately after the parameter transmission is changed.
Examples
# Specify the parameter transmission method as http-post for DDNS update requests for DDNS policy steven_policy.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] method http-post
Related commands
ddns policy
display ddns policy
password
Use password to specify the password for logging in to the DDNS server.
Use undo password to restore the default.
Syntax
password { cipher | simple } string
undo password
Default
No password is specified for logging in to the DDNS server.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
cipher: Specifies a password in encrypted form.
simple: Specifies a password in plaintext form. For security purposes, the password specified in plaintext form will be stored in encrypted form.
string: Specifies the password. Its plaintext form is a case-sensitive string of 1 to 32 characters. Its encrypted form is a case-sensitive string of 1 to 73 characters.
Examples
# In DDNS policy steven_policy, specify nevets as the password for logging in to the DDNS server.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] password simple nevets
Related commands
ddns policy
display ddns policy
url
username
ssl-client-policy
Use ssl-client-policy to associate an SSL client policy with a DDNS policy.
Use undo ssl-client-policy to restore the default.
Syntax
ssl-client-policy policy-name
undo ssl-client-policy
Default
No SSL client policy is associated with a DDNS policy.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
policy-name: Specifies a SSL client policy by its name, a case-insensitive string of 1 to 31 characters.
Usage guidelines
The SSL client policy is effective only for HTTPS-based DDNS update requests.
If you execute this command multiple times with different SSL client policies, the most recent configuration takes effect.
Examples
# Associate SSL client policy ssl_policy with DDNS policy steven_policy.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] ssl-client-policy ssl_policy
ddns policy
display ddns policy
ssl-client-policy (Security Command Reference)
url
Use url to specify the URL address for DDNS update requests.
Use undo url to restore the default.
Syntax
url request-url
undo url
Default
No URL address is specified for DDNS update requests.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
request-url: Specifies the URL address, a case-sensitive string of 1 to 240 characters.
Usage guidelines
The URL addresses configured for update requests vary by DDNS server. Common DDNS server URL address formats are shown in Table 6.
Table 6 Common URL addresses for DDNS update request
|
DDNS server |
URL addresses for DDNS update requests |
|
www.3322.org |
http://members.3322.org/dyndns/update?system=dyndns&hostname=<h>&myip=<a> |
|
DYNDNS |
http://members.dyndns.org/nic/update?system=dyndns&hostname=<h>&myip=<a> |
|
DYNS |
http://www.dyns.cx/postscript.php?host=<h>&ip=<a> |
|
ZONEEDIT |
http://dynamic.zoneedit.com/auth/dynamic.html?host=<h>&dnsto=<a> |
|
TZO |
http://cgi.tzo.com/webclient/signedon.html?TZOName=<h>IPAddress=<a> |
|
EASYDNS |
http://members.easydns.com/dyn/ez-ipupdate.php?action=edit&myip=<a>&host_id=<h> |
|
HEIPV6TB |
http://dyn.dns.he.net/nic/update?hostname=<h>&myip=<a> |
|
CHANGE-IP |
http://nic.changeip.com/nic/update?hostname=<h>&offline=1 |
|
NO-IP |
http://dynupdate.no-ip.com/nic/update?hostname=<h>&myip=<a> |
|
DHS |
http://members.dhs.org/nic/hosts?domain=dyn.dhs.org&hostname=<h>&hostscmd=edit&hostscmdstage=2&type=1&ip=<a> |
|
HP |
https://server-name/nic/update?group=group-name&myip=<a> |
|
ODS |
ods://update.ods.org |
|
GNUDIP |
gnudip://server-name |
|
PeanutHull |
· oray://phddns60.oray.net · oray://phservice2.oray.net |
The URL address cannot contain the username or password. To configure the username and password, use the username command and the password command.
HP and GNUDIP are common DDNS update protocols. The server-name parameter is the domain name or IP address of the service provider's server using one of the update protocols.
The URL address for an update request can start with:
· http://—The HTTP-based DDNS server.
· https://—The HTTPS-based DDNS server.
· ods://—The TCP-based ODS server.
· gnudip://—The TCP-based GNUDIP server.
· oray://—The TCP-based DDNS server.
The domain names of DDNS servers are members.3322.org and phddns60.oray.net. The domain names of PeanutHull DDNS servers can be phddns60.oray.net and phservice2.oray.net. The domain name phservice2.oray.net maps to the public IP address of the old version PeanutHull DDNS server, which is not maintained any more. You need to try several times upon failures to connect to the server. As a best practice, register a new account and a domain name on the PeanutHull DDNS of a new version. Determine the domain name in the URL according to the actual situation.
The port number in the URL address is optional. If you do not specify a port number, the default port number is used. HTTP uses port 80, HTTPS uses port 443, and the PeanutHull server uses port 6060.
The system automatically performs the following tasks:
· Fills <h> with the FQDN that is specified when the DDNS policy is applied to an interface.
· Fills <a> with the primary IP address of the interface to which the DDNS policy is applied.
You can also manually specify an FQDN and an IP address in <h> and <a>, respectively. In this case, the FQDN that is specified when the DDNS policy is applied to an interface will not take effect. As a best practice, do not manually change the <h> and <a> because your configuration might be incorrect.
You cannot specify an FQDN and IP address in the URL address for contacting the PeanutHull server. Alternatively, you can specify an FQDN when applying the DDNS policy to an interface. The system automatically uses the primary IP address of the interface to which the DDNS policy is applied as the IP address for DDNS update.
To avoid misinterpretation, do not include colons (:), at signs (@), and question marks (?) in your login username or password, even if you can do so.
If you execute this command multiple times, the most recent configuration takes effect.
Examples
# Specify the URL address for DDNS update requests for DDNS policy steven_policy. The device contacts www.3322.org for DDNS update.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] url http:// members.3322.org/dyndns/update?system=dyndns&hostname=<h>&myip=<a>
Related commands
ddns policy
display ddns policy
password
username
username
Use username to specify the username for logging in to the DDNS server.
Use undo username to restore the default.
Syntax
username username
undo username
Default
No username is specified for logging in to the DDNS server.
Views
DDNS policy view
Predefined user roles
network-admin
context-admin
Parameters
username: Specifies the username, a case-sensitive string of 1 to 32 characters.
Examples
# In DDNS policy steven_policy, specify steven as the username for logging in to the DDNS server.
<Sysname> system-view
[Sysname] ddns policy steven_policy
[Sysname-ddns-policy-steven_policy] username steven
Related commands
ddns policy
display ddns policy
password
url
