How to run IPv4 over IPv6 on linux VMs?


here is what you need to do:

on VM 1:
1.  modprobe ip6_tunnel
2.  ip -6 tunnel show mode any
3.  ip -6 tunnel add ip6tnl1 mode ip4ip6 remote 2003:1b39:110:1::133d/64 local 2003:1b39:110:1::133e/64
4.  ip -6 tunnel show mode any
5.  ip link set dev ip6tnl1 up
6.  ifconfig
7.  ip addr add 10.0.0.1/24 dev ip6tnl1


on VM 2:
1.  modprobe ip6_tunnel
2.  ip -6 tunnel show mode any
3.  ip -6 tunnel add ip6tnl1 mode ip4ip6 remote 2003:1b39:110:1::133e/64 local 2003:1b39:110:1::133d/64
4.  ip -6 tunnel show mode any
5.  ip link set dev ip6tnl1 up
6.  ifconfig
7.  ip addr add 10.0.0.2/24 dev ip6tnl1
9.  now from VM2 run: ping 10.0.0.1

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Dont forget the "modprobe ip6_tunnel" which start up things!
Make sure your distro is with kernel version 2.6.22 or above!
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p.s - if its already configured on the 2 VMs(you can see it if you run ifconfig or #ip a):
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VM1(13.1.1.62  62.225.0.59):
9: ip6tnl1: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1460 qdisc noqueue state UNKNOWN
    link/tunnel6 2003:1b39:110:1::133d peer 2003:1b39:110:1::133e
    inet 10.0.0.1/24 scope global ip6tnl1
    inet6 fe80::463:ccff:fe00:5169/64 scope link
       valid_lft forever preferred_lft forever

VM2(13.1.1.63,  62.225.0.60):
7: ip6tnl1: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1460 qdisc noqueue state UNKNOWN
    link/tunnel6 2003:1b39:110:1::133e peer 2003:1b39:110:1::133d
    inet 10.0.0.2/24 scope global ip6tnl1
    inet6 fe80::47b:a8ff:fe00:516a/64 scope link
       valid_lft forever preferred_lft forever