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IPv6 Statefull configuration

ciscosupp
ciscosupp asked
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Last Modified: 2014-12-08
I have a DHCPv6 on my network IPv6 clients get IPv6 address but no default gateway.
My gateway is a SVI on a nexus switch. What must I configure on the nexus so my clients can get default gateway via RA.
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Commented:
Correct, if the Nexus is the GW then it will send out the RAs once configured. You may wish to send additional information to the clients via setting the O and M bits.

 The traditional sequence of events is:
A router attached to a network will announce it as a router that is sending periodic RA's (Router Advertisements). If the router wishes the attached clients to use DHCPv6 for acquiring an IPv6 address, it can signal that with setting the `O' and `M' bits in the Router Advertisement (RA). The two bits of importance within a Router Advertisement (RA) are:

a. M-bit: 1-bit "Managed address configuration" flag. When set, clients use DHCPv6 protocol for address configuration.

b. O-bit: 1-bit "Other stateful configuration" flag. When set, hosts use DHCPv6 to obtain `other' (non-address) information.


http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enterprise-ipv6-solution/whitepaper_c11-689821.html


harbor235 ;}

Author

Commented:
Thanks for info
I have set the M-bit and O-bit but what setting must I add so that the client gets a GW.
All clients get ipv6 and DNS setting from DHCPv6 except for the GW.
Please advice
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Commented:
There are several ways to receive GW info, you can assign the GW manually, you can receive it via a RA or a RS, or you can receive it via the DHCPV6 server. So, if your DHCPV6 server is only configured to send an IP address and/or DNS resolver information then it would receive the GW info from the RA or RS. If your DHCPV6 server is setup to send all the information then that's how the client will receive the GW info.

If you have your DHCPV6 server sending an ip address and DNS resolver info only, and you are not receiving the GW info,
then how is the GW routed interface configured? Are you filtering RAs?

Please provide information on you or configuration and what device provides which services?

Iassume that all devices have IPV6 properly configured? OS types?


harbor235 ;}

Author

Commented:
Remember DHCPv6 does not support a filed for DW otherwise I would configure it.
I don’t filter RAs
See attached config of my SVI.
Clients are windows 7 machines.
SVI-Config.jpg
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Commented:
This one is on us!
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