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Wednesday, April 11, 2012

Force IPv4 precendence over IPv6

Since a couple of days ago, apt-get tries to contact some of the hosts from my /etc/apt/sources.list via IPv6 and fails. To force it to prefer IPv4 over IPv6, add in /etc/gai.conf:

precedence ::ffff:0:0/96  100

This can be forced globally by adding to /etc/sysctl.conf, then reloading settings with sysctl -p

net.ipv6.conf.all.disable_ipv6 = 1 
net.ipv6.conf.all.forwarding = 0 

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