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Disable IPV6

CentOS 6.2, 6.5

Add to /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

On a running system:

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6

RedHat 5.10

Add to /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1

Update /etc/sysconfig/network

NETWORKING_IPV6=no

Disable ip6tables

chkconfig ip6tables off
reboot...

Debian

echo net.ipv6.conf.all.disable_ipv6=1 >> /etc/sysctl.d/disableipv6.conf
echo net.ipv6.conf.default.disable_ipv6 = 1 >> /etc/sysctl.d/disableipv6.conf
echo net.ipv6.conf.lo.disable_ipv6 = 1 >> /etc/sysctl.d/disableipv6.conf

FreeBSD

FreeBSD 10: /etc/sysctl.conf

For make: /etc/make.conf OPTIONS_UNSET=IPV6 X11