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By default, RHEL kernel comes with IPv6 enabled. Since many of us don't need it, it's pointless to recompile the kernel just to disable IPv6.

To disable IPv6 on RHEL 5 add the following lines in /etc/modprobe.conf:

Code: Select all

alias net-pf-10 off
alias ipv6 off


This will require a reboot.

More info on the Linux ipv6 module:

Code: Select all

[root@rhel54 ~]# modinfo ipv6
filename:       /lib/modules/2.6.18-164.el5/kernel/net/ipv6/ipv6.ko
alias:          net-pf-10
license:        GPL
description:    IPv6 protocol stack for Linux
author:         Cast of dozens
srcversion:     5D50A95B111AE2FDBAE69B3
depends:        xfrm_nalgo
vermagic:       2.6.18-164.el5 SMP mod_unload 686 REGPARM 4KSTACKS gcc-4.1
parm:           disable:Disable IPv6 such that it is non-functional (int)
module_sig:     883f3504a8b7b7d18758d6145e112557509e204e4356832069beabcc042d7c7e614115c428a09d1dd7afb138727ae29f407762469f552ecec8b6f