Network/IPv6/tunnels

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IPv6 in IPv4[edit]

This is the most common situation: you want your IPv6 connectivity on your road warrior through your VPN:

Debian/Ubuntu:[edit]

router: /etc/network/interfaces

auto tunv6
iface tunv6 inet6 v4tunnel
    address 2001:cafe:babe:1::1
    netmask 64
    endpoint 192.168.255.10
    local 192.168.255.1
    ttl 64


road warrior: /etc/network/interfaces

auto tunv6
iface tunv6 inet6 v4tunnel
    address 2001:cafe:babe:1::2
    netmask 64
    gateway 2001:cafe:babe:1::1
    endpoint 192.168.255.1
    local 192.168.255.10
    ttl 64


Shell commands:[edit]

Machine A:

ip tunnel add v6tun mode sit remote 192.168.255.10 local 192.168.255.1 ttl 63
ip link set v6tun up mtu 1280
ip addr add 2001:cafe:babe:1::1/96 dev v6tun

Machine B:

ip tunnel add v6tun mode sit remote 192.168.255.1 local 192.168.255.10 ttl 63
ip link set v6tun up mtu 1280
ip addr add 2001:cafe:babe:1::2/96 dev v6tun

IPv4 in IPv6[edit]

The weirdest and most interesting one: suppose you have equipment that is not IPv6 compatible, yet you want to connect them through a v6-only link between the two endpoints

Machine A:

ip -6 tunnel add v4tun mode ipip6 local 2a00:ffde:4567:edde::4987 remote 2001:473:fece:cafe::5179
ip addr add 192.168.99.1/24 dev v4tun
ip link set dev v4tun up

Machine B:

ip -6 tunnel add v4tun mode ipip6 remote 2a00:ffde:4567:edde::4987 local 2001:473:fece:cafe::5179
ip addr add 192.168.99.2/24 dev v4tun
ip link set dev v4tun up

Sources:[edit]

[1]

Work in progress[edit]

This page will be updated with what we will find next...