[c-nsp] IOS 15.0 ipv6-related weirdness (fails to fallback to ipv4)

[Michael Ulitskiy]

On Tuesday 10 July 2012 13:23:51 Bruce Pinsky wrote:
> Michael Ulitskiy wrote:
> > Heh.
> >
> > c2800#sh ipv6 interface
> > VoIP-Null0 is up, line protocol is up
> >   IPv6 is enabled, link-local address is FE80::226:99FF:FED0:1290
> >   No Virtual link-local address(es):
> >   No global unicast address is configured
> >   Joined group address(es):
> >     FF02::1
> >     FF02::1:FFD0:1290
> >   MTU is 1500 bytes
> >   ICMP error messages limited to one every 100 milliseconds
> >   ICMP redirects are enabled
> >   ICMP unreachables are sent
> >   ND DAD is not supported
> >   ND reachable time is 30000 milliseconds (using 30000)
> >
> > Don't see any way to disable it. Can't even find any description what it is, but obviously it's
> > voip-related and this router is indeed sip gateway.
> > Now I have to make sure that sip servers it's talking to don't publish AAAA, until I manage
> > to upgrade to something that has it fixed.
> 
> 
> Have you tried?:
> 
> int voip-null0
>  no ipv6 enable

 
c2800#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
c2800(config)#int voip-null0
                             ^
% Invalid input detected at '^' marker.


never that easy :(