IPv6 Statefull configuration

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.
ciscosuppAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

harbor235Commented:
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 ;}
0
ciscosuppAuthor 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
0
harbor235Commented:
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 ;}
0
ciscosuppAuthor 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
0
harbor235Commented:
Yo are right, I was mixing up v4 and v6 regarding the dhcp service. What OS is the client?

What happens when you run wireshark, you can see the RA advertised with L flag? L means the router is announcing itself as the GW

Linux: ip -6 neigh show
Windows: from cmd window
                         netsh>
                         netsh> interface ipv6
                         netsh> show route         - dispaly v6 routing table look for ::/0

OSs vary on how GW can be configured, it would help to know what you have and which dhcpv6 server you are using.

harbor235 ;}
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.