MTU: Maxitum Transmission Unit 最大传输单元

MSS: Maxitum Segment Size 最大分段大小

网络链路MTU测试 

Linux：

ping -s 1449  -M  do  www.example.com

Windows：

ping  -l 1500  -f   www.example.com

icmp header: 8 bytes

ip header: 20 bytes

tcp header: 20 bytes

参考 

How MTU and MSS Affect Networks?

https://www.geeksforgeeks.org/how-mtu-and-mss-affect-networks

IP MTU and TCP MSS Missmatch – an evil for network performance

https://blog.apnic.net/2014/12/15/ip-mtu-and-tcp-mss-missmatch-an-evil-for-network-performance

Troubleshooting Path MTU and TCP MSS Problems

https://www.thousandeyes.com/blog/troubleshooting-path-mtu-tcp-mss-problems

TCP MSS配置过大导致上网慢 

https://support.huawei.com/enterprise/zh/knowledge/EKB1000052671

ROS修改MTU和MSS解决上网慢和页面显示不全问题

https://zhuanlan.zhihu.com/p/117365627

gre over ipsec mtu及mss问题

https://www.cnblogs.com/xiaomai-rhce/p/15601236.html