Table of Contents

Chapter 1 DNS Configuration Commands. 1-1

1.1 DNS Configuration Commands. 1-1

1.1.1 display dns domain. 1-1

1.1.2 display dns dynamic-host 1-2

1.1.3 display dns server 1-3

1.1.4 display ip host 1-4

1.1.5 dns domain. 1-5

1.1.6 dns resolve. 1-6

1.1.7 dns server 1-6

1.1.8 ip host 1-7

1.1.9 reset dns dynamic-host 1-8

 

Chapter 1  DNS Configuration Commands

1.1  DNS Configuration Commands

1.1.1  display dns domain

Syntax

display dns domain [ dynamic ]

View

Any view

Parameter

dynamic: Display the DNS suffixes dynamically configured by DHCP or other protocols.

Description

Use the display dns domain command to display the DNS suffixes.

Related command: dns domain.

Example

# Display DNS suffixes

<Sysname> display dns domain

 Type:

  D:Dynamic    S:Static

 

No.    Type   Domain-name

1      S      net

2      S      com

Table 1-1 Description on the fields of display dns domain command

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

 

1.1.2  display dns dynamic-host

Syntax

display dns dynamic-host

View

Any view

Parameter

None

Description

Use the display dns dynamic-host command to display the dynamic domain name resolution cache information.

After a successful domain name resolution, the DNS Client saves the result in the cache. In the case of a repeated domain name resolution request, the DNS Client first searches the cache for the mapping between the domain name and the IP address. If the mapping is cleared because of timeout, the DNS Client sends the domain name resolution request to the DNS server.

Example

# Display the information in the dynamic domain name resolution cache.

<Sysname> display dns dynamic-host

No  Domain-name           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 Description on the field of the display dns dynamic-host command

Field	Description
No	Sequence number
Domain-name	Domain name
IP Address	IP address for the corresponding domain name
TTL	Time for storing in the cache memory (s).

 

 

1.1.3  display dns server

Syntax

display dns server [ dynamic ]

View

Any view

Parameter

dynamic: Display the DNS Server information configured by DHCP or other protocols

Description

Use the display dns server command to display the DNS Server information.

Related command: dns server.

Example

# Display the DNS Server information.

<Sysname> display dns server

Type:

  D:Dynamic    S:Static

 

IPv4 DNS Servers :

Domain-server Type  IP Address

     1        S     169.254.65.125

 

IPv6 DNS Servers :

Domain-server Type  IPv6 Address                    (Interface Name)

     1        S     3001::2

Table 1-3 Description on fields of the display dns server command

Field	Description
Domain-server	Number of the DNS Server. Configured automatically by the device, starts from 1. Servers with IPv4 or IPv6 addresses are numbered respectively.
Type	Type of the DNS server. S means the DNS server is statically specified; D means the DNS server is dynamically obtained through some protocols, like DHCP.
IP Address	IPv4 address of the DNS Server
IPv6 Address	IPv6 address of the DNS Server
Interface Name	Only available when the DNS Server is configured with an IPv6 address.

 

1.1.4  display ip host

Syntax

display ip host

View

Any view

Parameter

None

Description

Use the display ip host command to display the host names and corresponding IP addresses in the static domain name resolution resolving list.

Example

# Display the host names and corresponding IP addresses in the static domain name resolution resolving list.

<Sysname> display ip host

Host         Age     Flags       Address

My           0       static      1.1.1.1

Aa           0       static      2.2.2.4

Table 1-4 Description on fields of the display ip host command

Field	Description
Host	Host
Age	Time to live. 0 means the static list is never outdated. You can only manually remove the mappings between host names and IP addresses.
Flags	Mapping types between host names and IP addresses. Static is the type for static domain name resolution
Address	Host IP addresses

 

1.1.5  dns domain

Syntax

dns domain domain-name

undo dns domain [ domain-name ]

View

System view

Parameter

domain-name: DNS suffixes, comprises 1 to 238 characters ( non-case sensitive ), including letters, numbers, hyphens (-), underscores (_), and dots (.).

Description

Use the dns domain command to configure the DNS suffixes.

Use the undo dns domain command to delete the DNS suffixes.

No DNS suffixes are configured by default.

You can configure maximum 10 DNS suffixes. You must input the suffix name to delete it, otherwise, all the statically configured suffixes are deleted.

Related command: display dns domain.

Example

# Configure com as a DNS suffix.

<Sysname> system-view

[Sysname] dns domain com

1.1.6  dns resolve

Syntax

dns resolve

undo dns resolve

View

System view

Parameter

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.

Example

# Enable dynamic domain name resolution.

<Sysname> system-view

[Sysname] dns resolve

1.1.7  dns server

Syntax

dns server ip-address

undo dns server [ ip-address ]

View

System view

Parameter

ip-address: IP address of the DNS Server.

Description

Use the dns server command to configure an IP address to the DNS Server.

Use the undo dns server to remove IP addresses.

No IP address is configured to the DNS Server by default.

Including DNS servers with IPv6 addresses, you can configure maximum 6 DNS Servers .

Related command: display dns server.

Example

# Configure a DNS Server address to 172.16.1.1.

<Sysname> system-view

[Sysname] dns server 172.16.1.1

1.1.8  ip host

Syntax

ip host hostname ip-address

undo ip host hostname [ ip-address ]

View

System view

Parameter

Hostname: Host name, comprises 1 to 20 characters ( non-case sensitive ), including letters, numbers, hyphens (-), 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 mapping between host name and IP address in the static resolving list.

Use the undo ip host command to remove the mapping.

No mapping entry between IP address and host name is available in static DNS table by default.

You can configure only one mapping between IP address to host name. For example, a new mapping configured will overwrite the old one if there is any.

Related command: display ip host.

Example

# Configure IP address 10.110.0.1 to a host named aaa.

<Sysname> system-view

[Sysname] ip host aaa 10.110.0.1

1.1.9  reset dns dynamic-host

Syntax

reset dns dynamic-host

View

User view

Parameter

None

Description

Use the reset dns dynamic-host command to clear the cache.

Related command: display dns dynamic-host.

Example

# Clear the cache.

<Sysname> reset dns dynamic-host