Disable IPv6 support of a RHEL6 system

rhel.ks-disable-ipv6.sh

#!/bin/sh
#
# Disable IPv6 support of RHEL6 systems
#
 
echo "In script ($0)..." >> /var/log/anaconda.log
 
RHELVER=`cat /etc/redhat-release | sed "s/.*release \([0-9]*\).*/\1/"`
 
if [ $RHELVER -ge "6" ] && [ -d /etc/modprobe.d ]; then
 
  chkconfig ip6tables off
  echo "blacklist ipv6" >> /etc/modprobe.d/ipv6.conf
 
  cat << EOF >> /etc/sysctl.conf
  # Disable ipv6 support
  net.ipv6.conf.all.disable_ipv6 = 1
  net.ipv6.conf.default.disable_ipv6 = 1
EOF
 
  cat << EOF >> /etc/sysconfig/network
  NETWORKING_IPV6=off
  IPV6INIT=no
EOF
 
else
  echo "unable to disable ipv6 support" >> /var/log/anaconda.log
  exit
fi