dns-server (dhcpv4-pool-config)

Configures a network‘s DNS server. The DNS server supports all clients connected to networks supported by the DHCP server.

For DHCP clients, the DNS server‘s IP address maps the hostname to an IP address. DHCP clients use the DNS server‘s IP address based on the order (sequence) configured.

Supported on the following devices:

Syntax

dns-server [<IP>|<HOST-ALIAS-NAME>] {<IP1>|<HOST-ALIAS-NAME1>}

Parameters

dns-server [<IP>|<HOST-ALIAS-NAME>] {<IP1>|<HOST-ALIAS-NAME1>}

[<IP>|<HOST-ALIAS -NAME>]

Configures the primary DNS server, using one of the following options:

  • <IP> – Specifies the primary DNS server‘s IP address

  • <HOST-ALIAS-NAME> – Specifies a host alias, mapped to the primary DNS server‘s IP address

Note: A maximum of 8 DNS server‘s can be configured.
To enable redirection of DNS queries to OpenDNS it is necessary that the DNS server IP addresses provided here should point to the OpenDNS resolver (208.67.220.220 or 208.67.222.222). OpenDNS is a proxy DNS server that provides additional functionality, such as Web filtering, reporting, and performance enhancements in addition to DNS services. When configured on a WLAN, DNS queries from wireless clients are redirected to OpenDNS. The following example illustrates the configuration:
dhcp-server-policy dhcppolicy
 dhcp-pool dhcppool
  network 192.168.1.0/24
  address range 192.168.1.160 192.168.1.200
  default-router 192.168.1.105
  dns-server 208.67.220.220

Note, the above example shows the OpenDNS server as being 208.67.2202.220. The alternative IP address 208.67.222.222 can also be used.

For more information on the entire configuration that needs to be done to integrate WiNG access point, controllers, and service platform with OpenDNS , see opendns.

{<IP1>|<HOST-ALIAS- NAME1>}

Optional. Configures the secondary DNS server, using one of the following options:

  • <IP1> – Specifies the secondary DNS server‘s IP address

  • <HOST-ALIAS-NAME1> – Specifies a host alias, mapped to the secondary DNS server‘s IP address. If the primary DNS server is unavailable, the secondary server is used.

Note: A network host alias maps a name to a single network host. For example, ‘alias host $HOST 1.1.1.100‘. In this example the host alias is ‘$HOST‘ and it maps to a single host ‘1.1.1.100‘. For more information, see alias.

Examples

nx9500-6C8809(config-dhcp-policy-test-pool-testPool)#dns-server 192.168.13.19
nx9500-6C8809(config-dhcp-policy-test-pool-testPool)#show context
 dhcp-pool testPool
  address 192.168.13.4 class dhcpclass1
  ddns server 192.168.13.9
  ddns domainname WID
  ddns multiple-user-class
  bootfile test.txt
  default-router 192.168.13.8 192.168.13.9
  dns-server 192.168.13.19
nx9500-6C8809(config-dhcp-policy-test-pool-testPool)#

Related Commands

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Removes DNS server settings
9037762-01 Rev AA