Question : Get DNS to clients when using IPV6 Stateless configuration

I have a Cisco 2621XM configured on a /56 network.  My IPV6 is working great using stateless configuration on the clients, but I was wondering how you pass DNS servers to the clients since I am not using DHCP.  I tried setting up DHCPV6 with just the dns-server and domain-name options, but that does not work.

Anyone have an idea how to do this?

Answer : Get DNS to clients when using IPV6 Stateless configuration

Matt,

The client that needs DHCPv6 services knows whether to use DHCPv6 based upon the information from a router on its link-local network. The router has two configurable bits in its Router Advertisement (RA)
available for this purpose:
    * O bit — This allows the client to use DHCPv6 to retrieve other configuration parameters
     This would be set to aquire dns-servers, but not the client's IP address.

    * M bit —  This allows the client to use DHCPv6 to retrieve an  IPv6 address and
    other parameters from a DHCPv6 server.

Cisco at this time has no support for rdnss options as far as I am aware (RFC5006). You are stuck utilizing DHCPv6, or use RADVD (http://www.litech.org/radvd/) which does have support for DNS server options; however, at this point, you might as well use the DHCPv6 on Cisco and set the DNS server option.

Here is something that might help:

http://www.cisco.com/en/US/tech/tk872/technologies_white_paper09186a00801e199d.shtml

If it is still failing, you might want to consider enabling some debug options and even setting up some captures to troubleshoot.

Billy

Good Luck