Aug 20

RedHat 5 & Centos 5

Edit /etc/sysconfig/network and set “NETWORKING_IPV6” to “no”

* Add the following to /etc/modprobe.conf :

alias ipv6 off
alias net-pf-10 off


* Run chkconfig ip6tables off do disable the IPv6 firewall
* Reboot the system

To blacklist the module, simply save the following line in a file inside /etc/modprobe.d:

blacklist ipv6

written by MG \\ tags:

One Ping to “How to disable IPV6 on Redhat5, Centos5 & Fedora 9”

  1. User links about "disable" on iLinkShare Says:

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4 Responses to “How to disable IPV6 on Redhat5, Centos5 & Fedora 9”

  1. 1. derekmorr Says:

    Why do you want to disable IPv6? It doesn’t hurt anything to leave it enabled.

  2. 2. MG Says:

    I think because IPV6 slows down the IPV4 environment if the router out the door does not understand IPV6 and for most people IPV6 is not needed, and you will have some modules loaded (ipv6) and some configuration for networking not necessary.

  3. 3. derekmorr Says:

    How does IPv6 slow down IPv4 processing? If your machine is on a v4-only network, and has the v6 module loaded, it will configure a link-local IPv6 address. Since this address isn’t routable, it shouldn’t try to use IPv6 (e.g., it shouldn’t send AAAA queries for outgoing connections).

    While many people don’t need IPv6 today, we are rapidly running out of IPv4 addresses, and people will need to use IPv6 soon. The more machines that have IPv6 disabled, the harder it will be to reenable it later.

  4. 4. MG Says:

    I don’t think that IPv6 slows down IPv4, I disabled them because I don’t like the modules loaded when i don’t use them.

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