Ubuntu Linux: Tweak your network connectivity and/or performance by disabling IPV6

September 1st, 2008 by rvdavid Leave a reply »

Update: 17 March 2009: A quick note – this will only work for kernels preceeding 2.6.28-4.

While browsing for a solution for Firefox’s slow connection “bug”, I found a more “global” solution in Ubuntu. In short, the global solution is to blacklist IPV6.

You can do this simply by adding the following to /etc/modprobe.d/blacklist:

blacklist ipv6

As with everything that’s Linux, the argument from one eyed linux fans is that linux distros are not the ones to blame and have actually configured the default install correctly by enabling support for IPV6… Instead of blaming the distros, they say that you should be blaming the developers of applications that have this “bug” or “misconfiguration” in them.

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5 comments

  1. thetruth says:

    There is no any Firefox bug, it’s only your imagination. When you turn off IPv6 you are limiting your connectivity (even if your provider doesn’t support it now), that’s all, but you don’t care, you’ve read about blocking IPv6 somewhere and here you go, your net is now 10 times faster, LOL.

  2. rvdavid says:

    Hello “thetruth”

    > There is no any Firefox bug, it’s only your imagination.
    I agree with you, to a very, _very_ limited degree – it’s not really a bug per seh, which is why I’ve placed it in quotes (“”), but this is more a tweak to skip the delay which occurs when Firefox tries to recover from receiving an incorrect IPv4 address while expecting to receive an IPv6 address.

    > When you turn off IPv6 you are limiting your connectivity (even if your provider doesn’t support it now), that’s all
    That’s total FUD – I don’t see how disabling IPv6 limits my connectivity.

    > but you don’t care, you’ve read about blocking IPv6 somewhere and here you go, your net is now 10 times faster, LOL.
    You sound bitter, don’t worry man – I’ll enable IPv6 by removing the line I’ve added to blacklist IPv6 in ubuntu when it’s more supported.

    Thanks for sharing your thoughts, but it’s a little off from the truth… probably half of “the truth” if that – maybe you should have called yourself “thehalftruth”? J/K hehe ;)

  3. joe says:

    hes right this is to fix ancient browser bugs, speed test it yourself turning of ipv6 does ….. .^ nothing ^ (shock!)

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