In order to check that the stack works, execute #ping6 ::1

If the result is the following (or similar):

PING ::1(::1) with 56 data bytes

64 bytes from ::1: icmp_seq=1 ttl=64 time=0.046 ms
64 bytes from ::1: icmp_seq=2 ttl=64 time=0.016 ms
64 bytes from ::1: icmp_seq=3 ttl=64 time=0.013 ms
64 bytes from ::1: icmp_seq=4 ttl=64 time=0.012 ms
64 bytes from ::1: icmp_seq=5 ttl=64 time=0.009 ms

It means that you already have installed, correctly, the IPv6 stack in your machine.

In order to check that the kernel supports IPv6 you have to check that the following entry exists:

/proc/net/if_inet6

If don't so, you can try to load the IPv6 module by typing:

modprobe ipv6

If the previous command doesn't succeed your kernel hasn't IPv6 support and you should recompile it by enabling the IPv6 options in Network options

To load automatically the IPv6 module every time it is demanded, you has to add to the /etc/modules.conf file the following line:

alias net-pf-10 ipv6

alias sit0 ipv6

alias sit1 ipv6

alias tun6to4 ipv6

To disable the IPv6 module loading automation you has to use:

alias net-pf-10 off

To setup IPv6 you will need some of the following tools:

net-tools packet: for using ifconfig, route. All the current versions support IPv6.

iproute packet: The programe /sbin/ip must exist. Given the fact that this programe is an extension of the previous packet, all the versions have IPv6 support.