RHEL如何禁用IPv6

Release Found: Red Hat Enterprise Linux 4 and later

Red Hat Enterprise Linux 4 and 5 enable Internet Protocol Version 6 (IPv6) by default. However, in certain situations, some users may find it desirable to disable IPv6 support.

Disabling IPv6  Support Red Hat Enterprise Linux 4

If the following line exists in the /etc/modprobe.conf file, remove it:

alias net-pf-10 ipv6

Add the following line to the /etc/modprobe.conf file:

alias net-pf-10 off

Reboot the system to disable IPv6 support.

Re-enabling IPv6 Support Red Hat Enterprise Linux 4

Remove the following line from the /etc/modprobe.conf file.

alias net-pf-10 off

You must reboot the system to activate IPv6 support.

Disabling IPv6 Support Red Hat Enterprise Linux 5

If the following line exists in the /etc/modprobe.conf file, remove it:

alias net-pf-10 ipv6

Add the following line to the /etc/modprobe.conf file:

alias net-pf-10 off

In versions of Red Hat Enterprise Linux before 5.4, add the following line to the /etc/modprobe.conf file:

alias ipv6 off

In Red Hat Enterprise Linux 5.4 and later, add the following line to the /etc/modprobe.conf file:

options ipv6 disable=1

To prevent errors during the network initscript start routine, change the NETWORKING_IPV6 parameter in the /etc/sysconfig/network file to the following:

NETWORKING_IPV6=no

For completeness, it is a good idea to configure the ip6tables service not to start at boot by issuing the following command:

chkconfig ip6tables off

Once both the alias net-pf-10 off and alias ipv6 off lines are present in the /etc/modprobe.conf file and NETWORKING_IPV6=no is set in the /etc/sysconfig/network file, reboot the system to disable IPv6 support.

Re-enabling IPv6 Support Red Hat Enterprise Linux 5

To re-enable IPv6 on Red Hat Enterprise Linux 5 systems, remove the following lines from the  /etc/modprobe.conf file:

alias net-pf-10 off

alias ipv6 off

Set the following parameter in the /etc/sysconfig/network file:

NETWORKING_IPV6=yes

Re-enable ipv6tables by issuing the following command:

chkconfig ip6tables on

You must reboot the system to activate IPv6 support.

注意：

对于RHEL5.3，它默认的内核是2.6.18-128.el5，如果升级了内核到2.6.18-164.el5或者2.6.18-164.6.1.el5，则IPv6的禁用方法和RHEL5.4一样，即在/etc/modprobe.conf文件中用options ipv6 disable=1替代alias ipv6 off