Hi, We have multiple cases where our domU looses IPv6 connectivity for a while, then it pings again our IPv6 gateway. I''ve been searching on google for similar cases, but I found none, though this issue, it seems we have it on a lot of servers. Note that I''m using sock (up to date) Debian Squeeze kernel and hypervisor, with Xen 4.0 and kernel 3.6.32. Both domU which should be communicating together (one being connected to HE tunnels to provide the IPv6) are on the same physical server. Cheers, Thomas Goirand (zigo)