How to increase MTU?

Question

linux

There is the following scheme:
client ====> openvpn server ====> tunnel ====> nat server (access to the Internet)
On the tunnel mtu 1322, respectively, when we go to witch.valdikss.org.ru , for example, we see MTU 1322
I tried to change mss like here - https://www.opennet.ru/docs/RUS/LARTC/x2657.html it turns out to lower it, it's impossible to raise it above 1322 ((

Answer 1

I didn’t follow the links, I’ll venture to suggest that 1322 payload, and the rest is an overhead? then if there is no jumbo frame support, nothing will work. And what exactly is the task?

Answer 2

I think this is your case.
https://ru.wikipedia.org/wiki/Maximum_transmission...