Debian IPv6 Tunnel Config
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Configuring your etch host then requires you just to edit /etc/network/interfaces and add the following stanza at the end:
auto 6in4
iface 6in4 inet6 v4tunnel
address 2001:08B0:XXXX:0001::1
netmask 124
endpoint 81.187.81.6
ttl 64
up ip link set mtu 1280 dev 6in4
up ip route add default via 2001:08B0:XXXX:0001::2 dev 6in4
remembering to change the XXXX to whatever value you've been allocated.
After that just type "ifup 6in4" (as root) and your link should be up.