Home / server / Questions / 1098273
In Process
timy
Asked: 2022-04-11 01:57:08 +0800 CST

Linux Gateway Policy Routing and TCP MSS Issue(maybe)?

  • 772

I have an Ubuntu 20 machine as an internet gateway with two WANs ens160 and ens192. I switch the default route on the gateway like ip r re 0/0 dev160(or ens192) and the clients on the LAN access the web without any problem. But if I want to let a specific user through the specified WAN, such as

ip ru add from 192.168.3.60 lookup 100
ip r a 0/0 dev ens192 t 100

client 192.168.3.60 has an issue accessing some web resources like images, looks like a TCP MSS problem, but iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -o ens192 -j TCPMSS --clamp-mss-to-pmtu can't fix it.

Can anyone offer some help?

ubuntu

0 Answers