[6bone] IPv6 via NAT - problems

[Jeremy Worrells]

Good afternoon, 6bone!

I am a career sysadmin with a great interest in IPv6. I am trying to get a
small IPv6 network running at home, using Freenet6 and a FreeBSD 4.6.2
server. I have the software installed, and the interface comes up. However,
I cannot get a ping6 or traceroute6 to supply any answers. My Cisco 678 DSL
router is set up to NAT all protocol 41 and TCP port 4343 traffic to my
FreeBSD server. Here is the output from a tcpdump on another machine on the
LAN:

11:33:50.929054 worrells.dsl.xmission.com > www.freenet6.net:
jworrells.tsps1.freenet6.net > 3ffe:505:2008:1:2e0:18ff:fea8:4533: icmp6:
echo request (encap)
11:33:51.358566 www.freenet6.net > 172.16.0.4:
3ffe:505:2008:1:2e0:18ff:fea8:4533 > jworrells.tsps1.freenet6.net: icmp6:
echo reply (encap)

It appears that the packets are going to the right places, but are for some
reason not getting to the IPv6 stack. Here are my interface details:

fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 172.16.0.4 netmask 0xffffff00 broadcast 172.16.0.255
        inet6 fe80::203:47ff:fe98:96f5%fxp0 prefixlen 64 scopeid 0x1
        ether 00:03:47:98:96:f5
        media: Ethernet autoselect (10baseT/UTP)
        status: active
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
        tunnel inet 166.70.27.6 --> 206.123.31.114
        inet6 fe80::203:47ff:fe98:96f5%gif0 prefixlen 64 scopeid 0x7
        inet6 3ffe:b80:2:f1a6::2 --> 3ffe:b80:2:f1a6::1 prefixlen 128

Any ideas?

Jeremy