Information from: http://www.mjmwired.net/resources/mjm-fedora-fc6.html#ipv6
You might not need to do this step.
# vi /etc/sysconfig/network Change: NETWORKING_IPV6=yes To: NETWORKING_IPV6=no
# vi /etc/modprobe.d/network Add the following 2 lines: (A reboot will be required) alias net-pf-10 off alias ipv6 off
Display your current ipv6 firewall config settings: # /sbin/chkconfig --list ip6tables Disable the ipv6 firewall: # /sbin/chkconfig --level 2345 ip6tables off
In /etc/hosts, the following entry for localhost using IPv6 can be removed/commented out:
::1 localhost.localdomain localhost
If you choose to remove the above IPv6 entry, then you must keep the following IPv4 entry for localhost:
127.0.0.1 localhost.localdomain localhost