How to Disable IPV6

[ianw1974]

I thought this might be handy, even for the ones of us that know how to do it. I found there are multiple ways to do this. There are system-wide ways to disable, and you can also disable at interface level.

 

Please note, that this is for general networking, rather than disabling IPV6 within such applications, eg: Firefox.

 

Disable at system-wide level

 

To disable IPV6 at system-wide level, there are two methods.

 

1. Edit /etc/modprobe.conf and add the following line:

 

alias net-pf-10 off

 

2. Edit /etc/sysconfig/network and add the following line:

 

NETWORKING_IPV6=NO

 

Both of these would do effectively the same thing. Most of us here always use the first method, but thought it nice that there's an alternative :)

 

Disable at interface level

 

Only one method for disabling at interface level. Edit /etc/sysconfig/network-scripts/ifcfg-xxxxx where xxxxx is the specific interface, in this example I will use /etc/sysconfig/network-scripts/ifcfg-eth0, and you add this line:

 

IPV6INIT=NO

 

The benefit of this is, that if you have two network cards, you could disable on eth0 but leave IPV6 enabled on eth1, for example.