Disable IPv6

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Disabling Solely In Firefox

The way Firefox configures its use of the internet protocol IPv6 can slow down your connection. To disable IPv6 in Firefox:

  1. In Firefox in address bar type: about:config
  2. In Filter field enter: ipv6
  3. change the value for network.dns.disableIPv6 to true

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Since other applications such as Opera or Thunderbird can also experience this slowdown, you may want to turn off IPv6 system-wide. To do this, open a console and as root enter:

  echo "alias net-pf-10 off" >> /etc/modprobe.conf

This change takes effect after a reboot.

Thanks to Stefan_Nicolau for this tip.

Disabling System Wide

  • Open a Filer Manager Session - Super User Mode

(KDE-Start> System> File System> File Manager Super User Mode)

  • Navigate to directory /etc/modprobe.d
  • Right click in empty space in the browser window and choose Create New > Text File ....
  • Name the new file 00local (that's zero zero .... and no 3 letter .extension at end)
  • Open the file by clicking on it (still in SuperUser Filemanager) and paste these two lines:
alias net-pf-10 off
alias ipv6 off
  • Save and close the file
  • Still in SuperUser Filemanager, click to edit the file named blacklist.
  • Add this line to the very bottom of the file:
blacklist ipv6
  • Save, close, and at next reboot IPv6 should be off system wide, and hopefully browsing will be a little quicker.

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