一、设置IPv4优先:
Debian及Ubuntu:
修改/etc/gai.conf,取消下面这一行的注释
precedence ::ffff:0:0/96 100
centos:
新建文件 /etc/gai.conf,填写如下内容:
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
二、关闭IPv6
debian:
vim /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 sysctl -p
centos:
vi /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 =1 net.ipv6.conf.default.disable_ipv6 =1 sysctl -p