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Using Sixxs Tunnels on Debian

Check your address at Tunnel Details in


  • Your IPv6
  • IPv6 Prefix
  • PoP IPv6
  • PoP IPv4

Check your machine for IPv6 support in kernel:

$ cat /proc/net/if_inet6

If enable, will output a similar text:

00000000000000000000000000000001 01 80 10 80       lo
fe800000000000000218f3fffe1b7911 02 40 20 80     eth0
fe8000000000000002e07dfffed2fa0b 04 40 20 80     eth1

Now edit the /etc/network/interfaces file, insert the text, and change with your numbers:

auto sixxs
iface sixxs inet6 v4tunnel
        address YOUR_IPv6
        netmask 64 (last number in IPv6 Prefix)
        endpoint POP_IPv4
        ttl 64
        mtu 1280
        gateway POP_IPv6


$ ifup sixxs

If no return, are ok.

Check if are up:

$ ifconfig sixxs
sixxs     Link encap:IPv6 sobre IPv4
          endereço inet6: YOUR_IPv6/64 Escopo:Global
          endereço inet6: fe80::c0a8:1/64 Escopo:Link
          UP POINTOPOINT RUNNING NOARP  MTU:1480  Métrica:1
          RX packets:355 errors:0 dropped:0 overruns:0 frame:0
          TX packets:347 errors:0 dropped:0 overruns:0 carrier:0
          colisões:0 txqueuelen:0
          RX bytes:61527 (60.0 KiB)  TX bytes:99847 (97.5 KiB)

For check IPv6 connectivity:

$ping6 -c 3 POP_IPv6
--- POP_IPv6 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms