----- Original Message ----- > On Thu, Dec 8, 2011 at 11:53 AM, Randy Carpenter > <rcar...@network1.net> wrote: > > Tried that. I agree with others that it is an NDP issue. NDP for > > the GUA is fine, but just not for the link local. Is there > > something that would block only link local by default? > > > > I should add that I have another uplink to a different provider > > that works perfectly. The other end is Juniper for that one. > > Just to begin with: > 0) Does your Juniper device have the neighbor cache entry for Cisco > link-local address? What is the state of the entry?
Sometimes it does, sometimes I can't seem to get it. > Can you get packet capture on both sides? We have done this. > 1) is Cisco sending NS packets? Yes. > 2) is your Juniper receiving them? It does not appear to. Tracing v6 stuff on juniper seems to be hit or miss. > 3) is Juniper device sending anything back? No. (because of #2) > 4) are those NA reaching Cisco? No. (because of #2) > Any switch on the path? It is an L2 circuit that rides a couple of different pieces of gear before it lands at the other side. > [lazy mode on] I'd also suggest: > - debug ipv6 nd on cisco > - checking for bugs for IOS and JunOS versions you are using
