Hi, I have same strange IPv6 problem (not strictly SixXS related, aiccu is working fine) that I cannot localize. Perhaps someone has an idea how to debug this? The symptoms: - I have a router (I call it R) with IPv6 connection (using aiccu). IPv6 works fine there. - another machine (M) gets an IPv6 address from the router via radvd. distributing the address works fine - after booting M everything works fine initially, IPv6 works as intended - later IPv6 becomes unreliable for some reason. M still has an IPv6 address, but sometimes accessing IPv6 node just hangs. No error message, connections simply freeze. - the symptoms go away temporarily when I ping6 R from M I have no idea why this is the case. I had thought it might be a routing problem, but for testing purposes I manually configured the route from M to R and back, no change. The strange thing is the IPv6 must work somehow, as a simple ping solves it. Another minor detail: This used to work flawless in the past, I think an upgrade to a 2.6.28 kernel on M broke it (I am not 100% just this was the direct cause though, I noticed a few days later)