IPv6 (Cisco) Training - With the "dns-server domain-name (IPv6)" Commands

Well, since this article is a kind of long I'm going to get down to it, so far we begin without delay.

The "dns-server" (IPv6) command is a Cisco IOS "DHCP for IPv6 pool configuration" command mode that is used to specify the Domain Name System (DNS) IPv6 server (s) available on a network.

The following is the correct syntax and example of the "dns-server" (IPv6) command:

Syntax: Router (config-dhcp) # dns-server ipv6-address
Example: Router (config-dhcp) # dns-server 2001:0 DC8: 3000:3000 :: 42

Note that recall the router is in "DHCP for IPv6 pool configuration" mode and the argument is the address IPv6 IPv6 address of DNS servers available.

Now, if, if you're wondering, you can use (configure) the "dns-server" (IPv6), command multiple times on a router if you have multiple DNS servers on the network. And, the new IPv6 addresses will not delete (overwrite) the existing (previous) IPv6 addresses.

Also, if you need to remove a specific DNS server from the list of DNS servers, all you have to do is type the word "no" in front of the command as you see below:

Syntax: Router (config-dhcp) # no dns-server ipv6-address
Example: Router (config-dhcp) # no dns-server 2001:0 DC8: 3000:3000 :: 42

Ok, that pretty much sums up the "dns-server" (IPv6) command, so you spend the "domain-name" (IPv6) command.

The "domain-name" (IPv6) command, is also a Cisco IOS "DHCP for IPv6 pool configuration" command mode, but is used to configure a domain name for a DHCP server for IPv6 client, which is also known as a router applicant or RR.

The following is the correct syntax and example of the "domain-name" (IPv6) command:

Syntax: Router (config-dhcp) # domain-name domain
Example: Router (config-dhcp) # domain-name ittechtips.com

Note that recall the router is once again in "DHCP for IPv6 pool configuration" mode and the subject domain by specifying the domain name to be used by the client. Thus, in the above example of the router (client) is going to use the ittechtips.com domain name.

And, just like the "dns-server" (IPv6) command, the "domain-name" (IPv6) command can be used (configured) several times on a router. And, the new domain names will not delete (overwrite) the existing domain names.

Finally, if you need to remove a domain name from a DHCPv6 client (RR), you must type the word "no" in front of the "domain-name" (IPv6) command as shown below:

Syntax: Router (config-dhcp) # no domain-name domain
Example: Router (config-dhcp) # no domain-name ittechtips.com

I hope this article was very informative and helped you quickly understand the use of commands "DNS-server domain-name" (IPv6). If you need to know more, I suggest you visit my site, were you will find the latest information regarding Cisco IPv6 Design and implementation techniques.

To your success, ...