Disabling ipv6 functionality
Debian / Ubuntu Linux
In order to disable ipv6 support, create a new file named 00local under /etc/modprobe.d directory and puts following two lines:alias net-pf-10 off
alias ipv6 off
another way:
echo "blacklist ipv6" >> /etc/modprobe.d/blacklist.conf
the third way:
# vi /etc/modprobe.d/aliases
Find the line:
alias net-pf-10 ipv6
Replace with:
alias net-pf-10 off
alias ipv6 off
Disabling IPv6
Support Red Hat Enterprise Linux 4
If the following line exists in the
/etc/modprobe.conf file, remove it:
alias net-pf-10 ipv6
Add the following line to the
/etc/modprobe.conf file:
alias net-pf-10 off
Reboot the system to disable IPv6 support.
Re-enabling IPv6 Support
Red Hat Enterprise Linux 4
Remove the following line from the
/etc/modprobe.conf file.
alias net-pf-10 off
You must reboot the system to activate IPv6 support.
Disabling IPv6
Support Red Hat Enterprise Linux 5
If the following line exists in the
/etc/modprobe.conf file, remove it:
alias net-pf-10 ipv6
Add the following line to the
/etc/modprobe.conf file:
alias net-pf-10 off
In versions of Red Hat Enterprise Linux
before 5.4, add the following line to the
/etc/modprobe.conf file:
alias ipv6 off
In Red Hat Enterprise Linux 5.4 and later, add the following line to the
/etc/modprobe.conf file:
options ipv6 disable=1
To prevent errors during the network initscript start routine, change the
NETWORKING_IPV6 parameter in the
/etc/sysconfig/network file to the following:
NETWORKING_IPV6=no
For completeness, it is a good idea to configure the ip6tables service not to start at boot by issuing the following command:
chkconfig ip6tables off
Once both the
alias net-pf-10 off and
alias ipv6 off lines are present in the
/etc/modprobe.conf file and
NETWORKING_IPV6=no is set in the
/etc/sysconfig/network file, reboot the system to disable IPv6 support.
Re-enabling IPv6 Support
Red Hat Enterprise Linux 5
To re-enable IPv6 on Red Hat Enterprise Linux 5 systems, remove the following lines from the
/etc/modprobe.conf file:
alias net-pf-10 off
alias ipv6 off
Set the following parameter in the
/etc/sysconfig/network file:
NETWORKING_IPV6=yes
Re-enable ipv6tables by issuing the following command:
chkconfig ip6tables on
You must reboot the system to activate IPv6 support.
After that, restart your system and ipv6 just gone away.
NOTE: If you have a distribution that ipv6 support compiled into main kernel not built as module you still disable ipv6 through proc interface, or adding following line into /etc/sysctl.conf:
net.ipv6.conf.all.disable_ipv6 = 1