Prefer IPv4 over ipv6 . How to set ipv4 precedence

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How to set ipv4 priority w/o disabling ipv6.

You need to edit /etc/gain.conf to look like:

Centos: 

label       ::1/128        0
label       ::/0           1
label       2002::/16      2
label       ::/96          3
label       ::ffff:0:0/96  4
precedence  ::1/128        50
precedence  ::/0           40
precedence  2002::/16      30
precedence  ::/96          20
precedence  ::ffff:0:0/96  100


Ubuntu: 

precedence ::ffff:0:0/96  100
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