ip tunnel add america mode sit remote 129.250.128.19 local 70.30.85.168 ttl 64 dev eth0
ip link set america mtu 1280
ip link set america up
ip addr add 2001:0418:8004:8000::366 dev america
ip route add 2000::/3 dev america
-----
[root@localhost ~]# ping6 irc.ac.za
PING irc.ac.za(2001:4200:fffe:0:204:23ff:feb4:1d96) 56 data bytes
From ::1 icmp_seq=0 Destination unreachable: Address unreachable
From ::1 icmp_seq=1 Destination unreachable: Address unreachable
From ::1 icmp_seq=2 Destination unreachable: Address unreachable
From ::1 icmp_seq=3 Destination unreachable: Address unreachable
From ::1 icmp_seq=4 Destination unreachable: Address unreachable
--- irc.ac.za ping statistics ---
5 packets transmitted, 0 received, +5 errors, 100% packet loss, time 4004ms