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Slow Browsing Under Ubuntu

August 23rd, 2008 Mohammad Al-Shami Leave a comment Go to comments

EDIT: This post only covers IPv6, please check the update post which covers IPv6 and Firefox

Today when I rebooted to my Windows installation which I very rarely do, I noticed that browsing under Windows feels much faster than under Ubuntu. After booting back to Ubuntu I noticed the “looking up domain.tld” part was taking a lot of time, which seemed a little odd.

Anyways, after some googling I found out that Debian enables IPv6 by default and uses that before and uses it before IPv4. A quick remedy was:

sudo vi /etc/modprobe.d/bad_list

#Add this line
alias net-pf-10 off

After which you should reboot your system. Now browsing feels much faster. To speed it up a little I installed a local caching DNS server which works like a charm. A quick HOWTO can be found here

Hope this helps.

Categories: Linux, Technical Tags: , , , ,
  1. Derek Morr
    August 24th, 2008 at 03:08 | #1
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    Interesting. Do you have any packet captures of the DNS traffic when you have IPv6 enabled? I’d be interested to see which specific servers were giving you problems.

  2. Mohammad Al-Shami
    August 24th, 2008 at 06:52 | #2
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    Hi Derek,

    To be honest I don’t have any captures, but if I’m not mistaken all ISPs in Jordan don’t have IPv6 enabled, and all the Windows boxes on my home network resolve DNS faster.

    I did try to use dig and the speed increase is noticeable.

    I’d love to hear your comments and work with you on this.

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