Disable IPv6 in Ubuntu 8.04

Some may find that out-of-the-box, Hardy Heron’s network performance is painfully slow. By default, IPv6 is enabled, and chances are good that your nearest router can’t speak the language nor interpret DNS requests efficiently.

To disable IPv6, open a shell and append the following to /etc/modprobe.d/blacklist:

# disable ipv6
blacklist ipv6

Reboot.

To verify that IPv6 is disabled, run

lsmod | grep ipv6

or

ip a | grep inet6

The commands shouldn’t return any information. Firefox browsing speeds should be much improved.