IPv6 is newer version of IP Address. It is ugly, hard to remember lol
To list IPv6 address configured on your computer, run
ip -6 addr
Disable IPv6 On CentOS 7
Edit file
vi /etc/sysctl.conf
Add following
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1
Now run
sysctl -p
Temp Disable IPv6
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
On reboot IPv6 get activate again, unless you add above line to /etc/rc.local