Comments on: How to Disable IPV6 in Ubuntu

By: MarvinPa

MarvinPa — Wed, 22 Jun 2011 14:00:05 +0000

@Daniel Aleksandersen, this is the future posting. IPV6 is still not in wide use and is still causing all kinds of problems.

By: aprte

aprte — Fri, 12 Nov 2010 17:08:37 +0000

Thanks! very useful information.

By: stanz

stanz — Sun, 24 Oct 2010 05:11:56 +0000

Using 10.04 with updates-
same as above- no “aliases” file found!

some change is just a pain to users!!!

By: Andy

Andy — Sun, 22 Aug 2010 20:21:58 +0000

Add
net.ipv6.conf.all.disable_ipv6=1
to /etc/sysctl.conf and run sysctl -p.

Everything else is more less “wrong”. May want to reflect that in your blog.

By: Fatcow Hosting

Fatcow Hosting — Tue, 10 Aug 2010 10:21:54 +0000

IPv6 is disabled through your info but what is the issue with this.

By: Jonathan

Jonathan — Sun, 01 Aug 2010 13:21:15 +0000

I also have terribly slow internet on my usually trusty Ubuntu machine when upgraded to 10.04. It was fine during my first try out with the Live cd and immediately after install but once rebooted all networking slowed to a crawl. I’ve tried disabling ipv6 in Firefox without success. I also tried reinstalling on that machine with the same results.

The same version of Ubuntu works fine on my Netbook though.

i can’t find the aliases file to modify.

By: Andreas N

Andreas N — Tue, 30 Mar 2010 15:40:03 +0000

Using sysctl you can disable IPv6 on the running system without rebooting:

sysctl -w net.ipv6.conf.all.disable_ipv6=1

To disable permanently add “net.ipv6.conf.all.disable_ipv6=1″ to /etc/sysctl.conf.

By: Andrew P.

Andrew P. — Thu, 04 Mar 2010 18:33:31 +0000

Re: Comment by toniisam on January 27, 2010

I believe you’re correct. I tried upgrading from Ubuntu 8.10 to 9.04, and it worked HORRIBLY. It caused the Firefox and SeaMonkey browsers talking through my Netgear WGR614 wireless router to slow to a crawl -- about 1/10th the speed that my Windows computers run. At the time I couldn’t find an answer to my dilemma, so I had no choice except remove 9.04 and revert to 8.10, which I’m still using. I later read that Ubuntu 9.04 had IPv6 enabled by default. I also understand that most consumer network equipment doesn’t support IPv6 natively today, including the WGR614, although there is a way of doing it indirectly by “tunneling”. It’s a shame that Canonical Ltd. released this abomination on the user community. IPv4 should be enabled by default, with IPv6 available for those whose network environments support it. IPv6 may be the future of the Internet, but, as others have commented above, the future isn’t here yet.

By: toniisam

toniisam — Wed, 27 Jan 2010 11:49:45 +0000

I am running 9.10 at home and cannot get any internet access, not with a web browser or to do updates. In 8.10 and 9.04 this worked straight after installing. The file /etc/modprobe.d/aliases does not appear to be there.
Perhaps the file is somewhere else, or the system is different in 9.10. Fortunately I also have 9.04 installed and that works, but I have heard about lots of problems with 9.10. Hope they get them dealt with for the next long-term support release.

By: Juan

Juan — Fri, 15 Jan 2010 18:29:03 +0000

I’m running 9.10 32-bit server, but do not see the aliases file.

By: Jim

Jim — Thu, 10 Dec 2009 21:10:23 +0000

Even if your isp is using ipv6 your modem/gateway most likely is using nat/pat to translate it to a ipv4 private address. Unless you have a machine right up against the interenet, like a webserver, you probably dont need ipv6.

By: lars

lars — Wed, 02 Dec 2009 09:44:11 +0000

The information will be useful to many. Thanks to author!

By: Michael

Michael — Sat, 28 Nov 2009 21:18:39 +0000

I had to edit the file “menu.lst” there was no “grub” file to edit that I could find - but that did the trick. Thanks for the info. My e-mail is now much faster.

By: Klio?

Klio? — Fri, 27 Nov 2009 13:00:11 +0000

Useful information! Thanks to author!

By: Jonn

Jonn — Thu, 26 Nov 2009 09:00:37 +0000

Cool blog! Thanks for the information. Add to favorites;)

By: Farry_2012

Farry_2012 — Wed, 25 Nov 2009 12:29:40 +0000

Thanks for the information. Remarkable blog;)

By: hardy stevenson

hardy stevenson — Sat, 23 May 2009 03:31:36 +0000

in jaunty the aliases file is empty. But the probs
seem to most effect the http://www…so doing about:config
in firefox/ network.dns.disableIPv6 changed to true
made me happy enough…
the reasoning behind diabling IPv6 is that its
too early and IPv4 still dominates by far way far.
so it avoids hangups to revert…tootles

By: boold

boold — Mon, 16 Mar 2009 22:26:48 +0000

also for security reasons, several services had remote exploits in their ipv6-implementation, more will come.

By: Nick

Nick — Fri, 30 Jan 2009 19:16:54 +0000

… for security reason. There are a lot of machines using tunneling of ipv6 over ipv4 (e.g.teredo in windows) to overcome firewall rules of the admins and expose that way the corporate networks to the outside world. What sense make firewalls and NAT adresses, when they just get traversed by ipv6 traffic.

By: brainextender

brainextender — Thu, 29 Jan 2009 09:32:04 +0000

Would’nt it be the right way to disable/blacklist the ipv6 kernel modules in /etc/modprobe.d/blacklist?