UNIX BLOG

Usually it’s very important to disable ipv6 feature , anyway on the most virtual servers it’s not in use, also it’s interfere in the work of commands like netstat -n  or iptables.

In this article I will show how to disable ipv6 definitivly from the server.

first of all

echo "options ipv6 disable=1" > /etc/modprobe.d/disable-ipv6

if it doesn’t work use the next scheme

/etc/sysctl.conf

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

/etc/modprobe.d/blacklist-compat or nano /etc/modprobe.d/blacklist

blacklist ipv6

/etc/modprobe.d/modprobe.conf.dist or /etc/modprobe.d/modprobe.conf or /etc/modprobe.conf

install ipv6 /bin/true

now especially for CENTOS 5 and 6

/etc/sysconfig/network

NETWORKING_IPV6=no

/etc/sysconfig/network-scripts/ifcfg-eth0 or /etc/sysconfig/network-scripts/ifcfg-eth1

IPV6INIT=no
IPV6_AUTOCONF=no

After these changes, reboot the mashine

and you will get something like this in ifconfig , without ipv6

eth0      Link encap:Ethernet  HWaddr 00:22:3E:66:FE:55
inet addr123.512.232.222  Bcast:123.512.232.222  Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:592 (592.0 b)  TX bytes:774 (774.0 b)
Interrupt:246

 

Thank you for you atention, if you have other ideas how to  extend this article , tell us, you are welcome!

Tags: centos, debian, disable, ifconfig, ipv6, ipv6 disable, ipv6 turn off, turn off, ubuntu