Prefer IPv4 over IPv6

Linux configuration: prefer IPv4 over IPv6

Problematic

Some applications are not working correctly when IPv6 is the default mode. For instance that's the case of apt-get :(

Change settings for apt-get only

Create a new config file for APT:

/etc/apt/apt.conf.d/99force-ipv4

Add the follwing option:

Acquire::ForceIPv4 true;

That's all. You can now use apt-get with IPv4 only.

Change default priority

Network priority is set globally in the /etc/gai.conf file.

Edit configuration file

vim /etc/gai.conf

Assuming everything is commented, you have to uncomment line ~54 “precedence ::ffff:0:0/96 100″.

That's all ! :) Now you rather use IPv4 than IPv6.

Sources

• StackOverFlow: http://unix.stackexchange.com/questions/9940/convince-apt-get-not-to-use-ipv6-method
• http://linuxaria.com/pills/how-to-convince-apt-get-not-to-use-ipv6