[f-nsp] IPv6 on MLX stopped working

["Rolf Hanßen"]

Hello Niels,

you were right:
ICMPv6-ND: DAD: duplicate address XXXX:XXXX:200:5::1 on port v1359

The date matches a power outage in a DC, I moved the interface to the new
router and the old kicked in after coming back.

I am just wondering that the route keeps in place without an (active) IP
in that network.

Looks like I should use "ipv6 nd dad attempts 0" from now on. ;)

kind regards
Rolf

> * nsp at rhanssen.de ("Rolf Hanßen") [Mon 15 Jun 2015, 16:56 CEST]:
>>IPv6 stopped working for a ve interface, re-entering the IP solved it.
>>As far as I see this affected only that interface/IP.
>
> There may have been a loop in the VLAN corresponding to that ve
> interface, and DAD kicked in.  Removing and re-entering the IP address
> generally makes the router do another round of DAD, and if the
> duplicate address (i.e. the loop) is gone, then it will stick.
>
> So check your syslog, and whether the output of 'show ipv6 interface'
> at the time of the breakage included anything about DAD.
>
>
> 	-- Niels.
>
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