Icmp access lists on dhcp-pd deployments

[Matthew Luckie]

> What I'm seeing is that ICMP6 (echo) is allowed to the internet but
> I can't actually ping the link-local address of the default gateway.

I have seen something similar, which maybe the root cause.  Some
systems do not reply to a neighbour solicitation if it is directed to
a link-local address on the system.

http://www.ietf.org/mail-archive/web/ipv6/current/msg15927.html