1楼:https://zhuanlan.zhihu.com/p/63841157
2楼:# sysctl settings are defined through files in
net.ipv6.conf.all.disable_ipv6 = 1
..
3楼:A:PDI>ADX AND ADX>ADXR AND ADXR>MDI;
A:ADX>PDI AND PDI>ADXR AND ADXR>MDI;
4楼:net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv4 ..