Disable IPv6 From CentOS 7

carlosinfl · 11-19-2014, 03:18 PM

I'm trying to disable IPv6 completely from CentOS 7 running Systemd and would like some guidance on how officially this is done. I'm asking here because my confusion is if I simply need to do:

Code:

echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

or

Do I need to call ALL interfaces as well on my box because...and I quote from Arch Linux (yes CentOS is not Arch Linux):

Quote:

Note that you must list all of the targeted interfaces explicitly, as disabling all.disable_ipv6 does not apply to interfaces that are already "up" when sysctl settings are applied.

So would my /etc/sysctl.conf look as follows assuming my only two interfaces on the box are loopback (lo) and eth0 (enp0s25):

Code:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.enp0s25.disable_ipv6 = 1

Ihatewindows522 · 11-19-2014, 03:26 PM

Quote:

Originally Posted by carlosinfl

I'm trying to disable IPv6 completely from CentOS 7 running Systemd and would like some guidance on how officially this is done. I'm asking here because my confusion is if I simply need to do:

Code:

echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf

or

Do I need to call ALL interfaces as well on my box because...and I quote from Arch Linux (yes CentOS is not Arch Linux):

So would my /etc/sysctl.conf look as follows assuming my only two interfaces on the box are loopback (lo) and eth0 (enp0s25):

Code:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.enp0s25.disable_ipv6 = 1

It looks like you don't have a GUI installed, is that correct?

Might find this helpful
http://www.itzgeek.com/how-tos/linux...#axzz3JYIbUu7W

szboardstretcher · 11-19-2014, 03:49 PM

Once you have disabled,. you can test from here.
http://ipv6-test.com/