[j-nsp] IPv6 ND stopped working

[Alexander Koch]

Folks,

I have a problem with a customer that we connect to via a
switch, we both use Juniper, and it is the same VLAN on our
side for v4 and v6, and in the middle is a switch network
and he gets an untagged port. Effectively some time ago ND
stopped working and we could not ping each other then at
that time.

When I do a monitor traffic interface etc. I only see my
packets going out (ICMP6 neighbor solicitations or so), but
none coming in. Our customer sees the very same, no inbound
requests for him.

We both did a 'clear ipv6 neighbors' but that did not help.

Anyone has any hint where to look at to debug this further?

Thanks,
Alexander