Disable IPv6 in RHEL5
Unless your policy or network configuration requires it, disable IPv6.
To do so, prevent the kernel module from loading by adding the following line to
/etc/modprobe.conf
install ipv6 /bin/true
Next, add or change the following lines in /etc/sysconfig/network:
NETWORKING_IPV6=no
IPV6INIT=no
IPV6INIT=no
