macOS
System Preferences -> Network -> advanced -> Hardware
linux(CentOS)
修改 network-scripts 下面的配置文件后重启网络即可即可， eg: /etc/sysconfig/network-scripts/ifcfg-eth0
查看：
很简单， ifconfig 即可
修改：
MTU="1300"
IPV6_MTU="1300" #If you need
windows
查询:
netsh interface ipv4 show subinterfaces设置: ( 本地连接等需要双引号)
netsh interface ipv4 set subinterface "本地连接" mtu=1300 store=persistent参考
windows下修改MTU
linux下修改MTU
理解MTU
The basics – MTU, MSS, GRE, and PMTU (好文，待进一步好好看)
