Configure the DNS Option

This pool-specific option is offered to the DHCP client as a configuration parameter. This option is offered to DHCP clients in the pool only when there is no host-specific option for the client. If this option is not configured and there is no host option, the global option is used.

In this example, the DNS server address is 12.0.0.6.

1. Create the address pool.

   SEFOS# configure terminal
   SEFOS(config)# ip dhcp pool 1
   

2. Specify the DNS IP address.

   SEFOS(dhcp-config)# dns server 12.0.0.6
   SEFOS(dhcp-config)# end
   

3. Ensure that the DNS IP address has been configured.

   SEFOS# show ip dhcp server pools
   

   The output in switch 1 is:

   Pool Id                         : 1
   -------------------------------------------
   Subnet                          : 12.0.0.0
   Subnet Mask                     : 255.0.0.0
   Lease time                      : 95400 secs
   Utilization threshold           : 50%
   Start Ip                        : 12.0.0.1
   End Ip                          : 12.0.0.100
   Exclude Address Start IP        : 12.0.0.1
   Exclude Address End IP          : 12.0.0.10
    
   Subnet Options
   --------------
   Code       :     1, Value      : 255.0.0.0
   Code       :     6, Value      : 12.0.0.6
   Code       :    15, Value      : future