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ubuntu优先使用ipv4，但不禁用ipv6

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vim /etc/gai.conf

# 解除这行的注释 - 把前面的#去掉，来设置为ipv4优先
precedence ::ffff:0:0/96  100

# 也可以直接
echo "precedence ::ffff:0:0/96 100" >> /etc/gai.conf

# 验证
ping www.google.com

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