Quick way to disable IPv6 – Debian Squeeze (6)

echo "# Disable IPv6" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "#" >> /etc/sysctl.conf
reboot

Oh yeah, and if exim freaks out,
vi /etc/exim4/update-exim4.conf.conf
and change dc_local_interfaces so it reads
dc_local_interfaces='127.0.0.1'

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