Miscellany

#!/bin/sh
if ! [ -f /proc/net/if_inet6 ]
then echo "IPv6 is not installed!" 1>&2; exit 1; fi
ifconfig sit0 up \
&& ifconfig sit0 inet6 tunnel ::*.*.*.*\
&& ifconfig sit1 inet6 add *:*:*::*:*/128 \
&& route -A inet6 add ::/0 gw fe80::*:1855 dev sit1 \
&& route -A inet6 add 2000::/3 gw fe80::*:1855 dev sit1 \
&& ifconfig eth1 up \
&& ifconfig eth1 inet6 add *:*:*:*::/64 \
&& echo 1 > /proc/sys/net/ipv6/conf/all/forwarding \
&& echo 'interface eth1
{
    AdvSendAdvert on;
    prefix *:*:*:*::/64
    {
	AdvOnLink on;
	AdvAutonomous on;
    };
};' > /etc/radvd.conf \
&& /etc/init.d/radvd start \
&& echo "IPv6 configuration completed" || \
{ echo "IPv6 configuration failed!" 1>&2; exit 1; }