Comments on: How to Disable IPv6 in Fedora and CentOS http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/ An open-source software and technology related journal Fri, 03 Feb 2012 18:35:21 +0000 hourly 1 By: George Notaras http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-19034 George Notaras Sat, 22 Oct 2011 13:13:17 +0000 http://www.g-loaded.eu/?p=477#comment-19034 Paul, thanks for your feedback. Seems like a very clean way to disabe IPv6 functionality. Time permitting I'll do some research about it and update the article accordingly. However, I'm quite certain that the <code>net.ipv6.conf.all.disable_ipv6</code> key was not there at the time I wrote this post. Paul, thanks for your feedback.

Seems like a very clean way to disabe IPv6 functionality. Time permitting I’ll do some research about it and update the article accordingly. However, I’m quite certain that the net.ipv6.conf.all.disable_ipv6 key was not there at the time I wrote this post.

]]> By: Paul Preston http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-19033 Paul Preston Sat, 22 Oct 2011 08:06:51 +0000 http://www.g-loaded.eu/?p=477#comment-19033 for Red Hat 6 (and CentOS 6) users: According to following article it’s better to disable kernel ipv6 functionality as opose to removing the module: http://www.proxar.co.uk/technical-forum/ Kind Regards, Paul Preston for Red Hat 6 (and CentOS 6) users:

According to following article it’s better to disable kernel ipv6 functionality as opose to removing the module:
http://www.proxar.co.uk/technical-forum/

Kind Regards,
Paul Preston

]]> By: Lars Bailey http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-16875 Lars Bailey Fri, 31 Dec 2010 00:41:30 +0000 http://www.g-loaded.eu/?p=477#comment-16875 Some nice info on IPv6. If you do not want IPv6 at this time,without jumping through hoops; for RedHat/CentOS,add this to /etc/sysconfig/network. NOZEROCONF=yes This diables link-local on all interfaces. If you decide to transition to IPv6,remove the directive,and your PC is still IPv6 ready. Some nice info on IPv6.
If you do not want IPv6 at this time,without jumping through hoops;
for RedHat/CentOS,add this to /etc/sysconfig/network.

NOZEROCONF=yes

This diables link-local on all interfaces.
If you decide to transition to IPv6,remove the directive,and your PC is still IPv6 ready.

]]> By: George Notaras http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-14381 George Notaras Thu, 28 Oct 2010 23:15:36 +0000 http://www.g-loaded.eu/?p=477#comment-14381 @bharath: Thanks for your feedback. Does this method prevent the ipv6 module from loading entirely, even if an application requires it? @bharath: Thanks for your feedback.

Does this method prevent the ipv6 module from loading entirely, even if an application requires it?

]]> By: bharath vn http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-14309 bharath vn Tue, 26 Oct 2010 10:53:18 +0000 http://www.g-loaded.eu/?p=477#comment-14309 DISABLE IPV6 IN UBUNTU 9.10 gksu gedit /etc/default/grub CHANGE THIS LINE: GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash” TO GRUB_CMDLINE_LINUX_DEFAULT=”ipv6.disable=1 quiet splash” THEN UPDATE GRUB: sudo update-grub TO TEST WITH TERMINAL: ip a | grep inet6 DISABLE IPV6 IN UBUNTU 9.10
gksu gedit /etc/default/grub

CHANGE THIS LINE:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”

TO
GRUB_CMDLINE_LINUX_DEFAULT=”ipv6.disable=1 quiet splash”

THEN UPDATE GRUB:
sudo update-grub

TO TEST WITH TERMINAL:
ip a | grep inet6

]]> By: genius http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-11701 genius Mon, 09 Mar 2009 13:13:49 +0000 http://www.g-loaded.eu/?p=477#comment-11701 good information though but a direct approach will be better, tricky though @Nicosx good information though but a direct approach will be better, tricky though @Nicosx

]]> By: George Notaras http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-11607 George Notaras Thu, 11 Dec 2008 15:13:03 +0000 http://www.g-loaded.eu/?p=477#comment-11607 Hi Adrian, I haven't spent much time with the ipv6 internals. Actually, I have never bothered to set it up. I intend to do so though as soon as I can find some spare time. Thanks for your feedback. Hi Adrian, I haven’t spent much time with the ipv6 internals. Actually, I have never bothered to set it up. I intend to do so though as soon as I can find some spare time. Thanks for your feedback.

]]> By: Adrian http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-11577 Adrian Sun, 30 Nov 2008 16:15:41 +0000 http://www.g-loaded.eu/?p=477#comment-11577 Naturally, my above statement is incomplete. The new api 'getaddrinfo' seems to involve both ipv6 and ipv4. The old api 'gethostbyname' only hits ipv4. So, applications that use the new api will incur a timeout, even if ipv6 is disabled in the kernel and throughout the system. I guess glibc should be smarter about it and not hit the ip6 stack if it is disabled. Alas, ip6 is the future, so it is starting to assert itself. I wonder why (at least in my case) do I get that stupid timeout on ipv6. Maybe because I have an old firewall/router between my box and the DNS server, firewall that only understands ipv6... Naturally, my above statement is incomplete. The new api ‘getaddrinfo’ seems to involve both ipv6 and ipv4. The old api ‘gethostbyname’ only hits ipv4. So, applications that use the new api will incur a timeout, even if ipv6 is disabled in the kernel and throughout the system. I guess glibc should be smarter about it and not hit the ip6 stack if it is disabled. Alas, ip6 is the future, so it is starting to assert itself. I wonder why (at least in my case) do I get that stupid timeout on ipv6. Maybe because I have an old firewall/router between my box and the DNS server, firewall that only understands ipv6…

]]> By: Adrian http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-11575 Adrian Sun, 30 Nov 2008 13:22:46 +0000 http://www.g-loaded.eu/?p=477#comment-11575 My trouble is that using ipv6 renders DNS resolve incredibly slow. Strace shows the DNS request is sent both ipv4 and ipv6. Ipv4 returns immediately, while ipv6 times out, eventually. Waiting for this timeout on EACH DNS request is killing. My trouble is that using ipv6 renders DNS resolve incredibly slow. Strace shows the DNS request is sent both ipv4 and ipv6. Ipv4 returns immediately, while ipv6 times out, eventually. Waiting for this timeout on EACH DNS request is killing.

]]> By: George Notaras http://www.g-loaded.eu/2008/05/12/how-to-disable-ipv6-in-fedora-and-centos/#comment-11495 George Notaras Wed, 24 Sep 2008 21:49:34 +0000 http://www.g-loaded.eu/?p=477#comment-11495 So far, I haven't noticed any form of intelligent communication between the hardware and any OS. :-) I do not know if what you ask is possible, but, if it is, then I assume it will only happen after some manual configuration. So far, I haven’t noticed any form of intelligent communication between the hardware and any OS. :-) I do not know if what you ask is possible, but, if it is, then I assume it will only happen after some manual configuration.

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