On most of the Linux distribution IPv6 is enabled by default, which may cause your internet is slow working. you should better to disable IPv6 protocal in linux system and it maybe increase your web browsing speed or network security.
What Is IPv6?
Internet Protocol version 6 (IPv6) is the latest version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion.
How To Check If IPv6 is Enable Or Disable
There are two ways to check if IPv6 is disabled shown as below:
You can check the above line if containing “inet6 addr”, If yes, you machine is running IPv6 service.
2.check “disable_ipv6″ file to check if IPv6 is disabled,enter:
if you get “0” value, it means that IPv6 is enabled and “1” means it is disabled.
Proper way of disabling IPv6 subsytem in RedHat Linux 6 / CentOS 6 (dont unload modules or so)
You need to add the following lines at the end of /etc/sysctl.conf file:
and edit /etc/sysconfig/network file
your /etc/sysconfig/network file must be like this below
add this line to /etc/sysconfig/network-scripts/ifcfg-eth0
disable iptables6
restart your network service
and then verify your ipv6 no longer active with ifconfig command
PS: if you have more eth interfaces, use brain ;)
What Is IPv6?
Internet Protocol version 6 (IPv6) is the latest version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion.
How To Check If IPv6 is Enable Or Disable
There are two ways to check if IPv6 is disabled shown as below:
[23:36:33][root@servermox:~]# ifconfig
eth0 Link encap:Ethernet HWaddr 04:01:3D:AD:61:01
inet addr:192.168.1.22 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 1100:1180:0:d0::22:2001/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:48804698 errors:0 dropped:0 overruns:0 frame:0
TX packets:40747086 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:51379710551 (47.8 GiB) TX bytes:9427197744 (8.7 GiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1092103 errors:0 dropped:0 overruns:0 frame:0
TX packets:1092103 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:127922114 (121.9 MiB) TX bytes:127922114 (121.9 MiB)You can check the above line if containing “inet6 addr”, If yes, you machine is running IPv6 service.
2.check “disable_ipv6″ file to check if IPv6 is disabled,enter:
[23:36:38][root@servermox:~]# cat /proc/sys/net/ipv6/conf/all/disable_ipv6
0if you get “0” value, it means that IPv6 is enabled and “1” means it is disabled.
How To disable IPv6 on RHEL6 CentOS 6
Proper way of disabling IPv6 subsytem in RedHat Linux 6 / CentOS 6 (dont unload modules or so)
You need to add the following lines at the end of /etc/sysctl.conf file:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1and edit /etc/sysconfig/network file
NETWORKING_IPV6=noyour /etc/sysconfig/network file must be like this below
NETWORKING=yes
GATEWAY=192.168.1.254
NETWORKING_IPV6=no
HOSTNAME=servermox.servermox.com
DOMAINNAME=servermox.comadd this line to /etc/sysconfig/network-scripts/ifcfg-eth0
IPV6INIT=nodisable iptables6
[23:36:39][root@servermox:~]# chkconfig --level 345 ip6tables offrestart your network service
[23:36:41][root@servermox:~]# service network restartand then verify your ipv6 no longer active with ifconfig command
PS: if you have more eth interfaces, use brain ;)
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