Ok here we go again
[root@d75-152-109-214 ~]# modprobe ipv6
[root@d75-152-109-214 ~]# ip tunnel add he-ipv6 mode sit remote 216.66.38.58 local 75.152.109.214 ttl 255
[root@d75-152-109-214 ~]# ip link set he-ipv6 up
[root@d75-152-109-214 ~]# ip addr add 2001:470:1c:417::2/64 dev he-ipv6
[root@d75-152-109-214 ~]# ip route add ::/0 dev he-ipv6
[root@d75-152-109-214 ~]# ip addr add 2001:470:b115::1:1/64 dev eth0
[root@d75-152-109-214 ~]# ip addr add 2001:470:b115::2:1/64 dev eth1
[root@d75-152-109-214 ~]# ip -f inet6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:470:b115::1:1/64 scope global tentative
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fefb:c0cf/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:470:b115::2:1/64 scope global tentative
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fefb:c0d9/64 scope link
valid_lft forever preferred_lft forever
5: he-ipv6@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480
inet6 2001:470:1c:417::2/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::4b98:6dd6/128 scope link
valid_lft forever preferred_lft forever
[root@d75-152-109-214 ~]# sysctl -w net.ipv6.conf.all.forwarding=1
net.ipv6.conf.all.forwarding = 1
[root@d75-152-109-214 ~]# ip -6 route add :: via 2001:470:1c:417::1
[root@d75-152-109-214 ~]# ip route add 2000::/3 dev he-ipv6
[root@d75-152-109-214 ~]# ip route add 2001:470:b115::/48 dev eth1
[root@d75-152-109-214 ~]#
This should be right now, I hope.
[root@d75-152-109-214 ~]# ping6 2001:470:1c:417::1
PING 2001:470:1c:417::1(2001:470:1c:417::1) 56 data bytes
64 bytes from 2001:470:1c:417::1: icmp_seq=0 ttl=64 time=63.3 ms
64 bytes from 2001:470:1c:417::1: icmp_seq=1 ttl=64 time=63.2 ms
64 bytes from 2001:470:1c:417::1: icmp_seq=2 ttl=64 time=62.8 ms
--- 2001:470:1c:417::1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 3194ms
rtt min/avg/max/mdev = 62.873/63.137/63.302/0.188 ms, pipe 2
[root@d75-152-109-214 ~]#
Thats better

[root@d75-152-109-214 ~]# ping6 ipv6.google.com
PING ipv6.google.com(pw-in-x67.1e100.net) 56 data bytes
64 bytes from pw-in-x67.1e100.net: icmp_seq=0 ttl=50 time=148 ms
64 bytes from pw-in-x67.1e100.net: icmp_seq=1 ttl=50 time=149 ms
64 bytes from pw-in-x67.1e100.net: icmp_seq=2 ttl=50 time=148 ms
64 bytes from pw-in-x67.1e100.net: icmp_seq=3 ttl=50 time=148 ms
--- ipv6.google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 11080ms
rtt min/avg/max/mdev = 148.711/148.858/149.111/0.414 ms, pipe 2
[root@d75-152-109-214 ~]#
still works
LAN host can still only ping 2001:470:b115::2:1
All the Time I have today need to goto work.
I'll get back at it tomorrow