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| Title | Size | Download |
|---|---|---|
| 04-DNS Commands | 43.35 KB |
This document only covers IPv4 DNS configuration commands. For introduction to IPv6 DNS configuration commands, refer to IPv6 Basics Commands in the IP Services Volume.
DNS Configuration Commands
display dns domain
Syntax
display dns domain [ dynamic ]
View
Any view
Default Level
1: Monitor level
Parameters
dynamic: Displays the domain name suffixes dynamically obtained through DHCP or other protocols.
Description
Use the display dns domain command to display the domain name suffixes.
Related commands: dns domain.
Examples
# Display domain name suffixes.
<Sysname> display dns domain
Type:
D:Dynamic S:Static
No. Type Domain-name
1 S com
Table 1-1 display dns domain command output description
|
Field |
Description |
|
No |
Sequence number |
|
Type |
Type of domain name suffix: S represents a statically configured domain name suffix, and D represents a domain name suffix obtained dynamically through DHCP. |
|
Domain-name |
Domain name suffix |
display dns dynamic-host
Syntax
display dns dynamic-host
View
Any view
Default Level
1: Monitor level
Parameters
None
Description
Use the display dns dynamic-host command to display the information of the dynamic domain name resolution cache.
Examples
# Display the information of the dynamic domain name resolution cache.
<Sysname> display dns dynamic-host
No. Host IP Address TTL
1 www.baidu.com 202.108.249.134 63000
2 www.yahoo.akadns.net 66.94.230.39 24
3 www.hotmail.com 207.68.172.239 3585
4 www.eyou.com 61.136.62.70 3591
Table 1-2 display dns dynamic-host command output description
|
Field |
Description |
|
No |
Sequence number |
|
Host |
Domain name |
|
IP Address |
IP address for the corresponding domain name |
|
TTL |
Time that a mapping can be stored in the cache (in seconds). |
A domain name in the display dns dynamic-host command contains 21 characters at most. If a domain name consists of more than 21 characters, only the first 21 characters are displayed.
display dns proxy table
Syntax
display dns proxy table
View
Any view
Default Level
1: Monitor level
Parameters
None
Description
Use the display dns proxy table command to display the DNS proxy table.
Examples
# Display the DNS proxy table.
<Sysname> display dns proxy table
Total entries: 1
Source IP Source Port Trans ID Server IP Aging
192.168.0.98 1030 24580 192.168.111.244 35
Table 1-3 display dns proxy table command output description
|
Field |
Description |
|
Source IP |
Source IP address of the DNS request, that is, the IP address of the DNS client. |
|
Source Port |
Source port number of the DNS request |
|
Trans ID |
Transaction ID of the DNS request |
|
Server IP |
IP address of the DNS server |
|
Aging |
Aging time of the DNS proxy table entry in seconds |
display dns server
Syntax
display dns server [ dynamic ]
View
Any view
Default Level
1: Monitor level
Parameters
dynamic: Displays the DNS server information dynamically obtained through DHCP or other protocols
Description
Use the display dns server command to display the DNS server information.
Related commands: dns server.
Examples
# Display the DNS server information.
<Sysname> display dns server
Type:
D:Dynamic S:Static
DNS Server Type IP Address
1 S 172.16.1.1
Table 1-4 display dns server command output description
|
Field |
Description |
|
DNS Server |
Sequence number of the DNS server, configured automatically by the device, starting from 1. |
|
Type |
Type of domain name server: S represents a statically configured DNS server, and D represents a DNS server obtained dynamically through DHCP. |
|
IP Address |
IP address of the DNS server |
display ip host
Syntax
display ip host
View
Any view
Default Level
1: Monitor level
Parameters
None
Description
Use the display ip host command to display the host names and corresponding IP addresses in the static domain name resolution table.
Examples
# Display the host names and corresponding IP addresses in the static domain name resolution table.
<Sysname> display ip host
Host Age Flags Address
My 0 static 1.1.1.1
Aa 0 static 2.2.2.4
Table 1-5 display ip host command output description
|
Field |
Description |
|
Host |
Host name |
|
Age |
Time to live. 0 means that the static mapping will never age out. You can only manually remove the static mappings between host names and IP addresses. |
|
Flags |
Indicates the mapping type. Static represents static domain name resolution. |
|
Address |
Host IP address |
dns domain
Syntax
dns domain domain-name
undo dns domain [ domain-name ]
View
System view
Default Level
2: System level
Parameters
domain-name: Domain name suffix, consisting of character strings separated by a dot (for example, aabbcc.com). Each separated string contains no more than 63 characters. A domain name suffix may include case-insensitive letters, digits, hyphens (-), underscores (_), and dots (.), with a total length of 238 characters.
Description
Use the dns domain command to configure a domain name suffix. The system can automatically add the suffix to part of the domain name you entered for resolution.
Use the undo dns domain command to delete a domain name suffix (with a domain name suffix specified) or all domain name suffixes (with no domain name suffix specified).
No domain name suffix is configured by default, that is, only the provided domain name is resolved.
You can configure a maximum of 10 domain name suffixes.
Related commands: display dns domain.
Examples
# Configure com as a DNS suffix.
<Sysname> system-view
[Sysname] dns domain com
dns proxy enable
Syntax
dns proxy enable
undo dns proxy enable
View
System view
Default Level
2: System level
Parameters
None
Description
Use the dns proxy enable command to enable DNS proxy.
Use the undo dns proxy enable command to disable DNS proxy.
By default, DNS proxy is disabled.
Examples
# Enable DNS proxy.
<Sysname> system-view
[Sysname] dns proxy enable
dns resolve
Syntax
dns resolve
undo dns resolve
View
System view
Default Level
2: System level
Parameters
None
Description
Use the dns resolve command to enable dynamic domain name resolution.
Use the undo dns resolve command to disable dynamic domain name resolution.
Dynamic domain name resolution is disabled by default.
Examples
# Enable dynamic domain name resolution.
<Sysname> system-view
[Sysname] dns resolve
dns server
Syntax
dns server ip-address
undo dns server [ ip-address ]
View
System view
Default Level
2: System level
Parameters
ip-address: IP address of the DNS server.
Description
Use the dns server command to specify a DNS server.
Use the undo dns server to remove DNS server(s).
No DNS server is specified by default.
You can configure a maximum of six DNS servers, including those with IPv6 addresses.
Related commands: display dns server.
Examples
# Specify the DNS server 172.16.1.1.
<Sysname> system-view
[Sysname] dns server 172.16.1.1
ip host
Syntax
ip host hostname ip-address
undo ip host hostname [ ip-address ]
View
System view
Default Level
2: System level
Parameters
Hostname: Host name, consisting of 1 to 20 characters, including case-insensitive letters, numbers, hyphens (-), underlines (_), or dots (.). The host name must include at least one letter.
ip-address: IP address of the specified host in dotted decimal notation.
Description
Use the ip host command to create a host name to IP address mapping in the static resolution table.
Use the undo ip host command to remove a mapping.
No mappings are created by default.
You can configure only one mapping for a host name. A mapping newly configured for the host name will overwrite the previous one if there is any.
Related commands: display ip host.
Examples
# Map the IP address 10.110.0.1 to the host name aaa.
<Sysname> system-view
[Sysname] ip host aaa 10.110.0.1
reset dns dynamic-host
Syntax
reset dns dynamic-host
View
User view
Default Level
2: System level
Parameters
None
Description
Use the reset dns dynamic-host command to clear the dynamic domain name resolution information.
Related commands: display dns dynamic-host.
Examples
# Clear the dynamic domain name resolution information.
<Sysname> reset dns dynamic-host
