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Aug
20
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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
FEDORA 9
To blacklist the module, simply save the following line in a file inside /etc/modprobe.d:
blacklist ipv6
One Ping to “How to disable IPV6 on Redhat5, Centos5 & Fedora 9”
4 Responses to “How to disable IPV6 on Redhat5, Centos5 & Fedora 9”
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1. derekmorr Says:
August 21st, 2008 at 12:53 amWhy do you want to disable IPv6? It doesn’t hurt anything to leave it enabled.
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2. MG Says:
August 21st, 2008 at 8:45 amI 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.
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3. derekmorr Says:
August 21st, 2008 at 5:35 pmHow 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.
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4. MG Says:
September 8th, 2008 at 11:09 pmI 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.
November 3rd, 2008 at 7:34 am
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