Debian 关闭 IPv6

永久

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

临时

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

sysctl -w net.ipv6.conf.lo.disable_ipv6=1