I have an ipv6 tunnel that refuses to work until traffic goes outbound. if I turn the device on and ping in, I get no response until the second I start to ping out. if I then walk away for a few hours and try to ping in again, I'll get no response.
I'm using Debian Lenny and Hurricane Electric for my tunnel. I'm not even sure where to begin debugging this behavior because it's so unusual. I've used both of the Debian configs from http://www.tunnelbroker.net/forums/index.php?topic=18.0 and the configs from http://wiki.debian.org/DebianIPv6 and a variety of tweaks in between, but I still cannot get the device to persistently accept inbound traffic. there's no ip6tables, but I do have a variety of iptable rules. has anyone else experienced this kind of issue? what could I possibly do to debug or solve this?
edit: there's no NAT involved and it's all IPv4 Cisco infrastructure. I dont think there's any IPv6 between me, the switches and the router.