tun-mtu, fragment and mssfix: Client, Server or Both?

[MBNH]

We have server-side conf files and client-side ovpn files. If I want to troubleshoot an MTU issue, do I use the tun-mtu, fragment and mssfix parameters in the client or server config, or both?

[Traffic]

Use --fragment and --mssfix in both your configs as these cannot be pushed.

Also try:

Code: Select all

mtu-disc yes
mtu-test

in both your configs.

This thread may help:
confusion over udp "fragment"

[bmarien]

Just wondering,

Can we use the output of the test in some script? Or can the result be written to file?


Thanks

[Traffic]

Can we use the output of the test in some script?

Unlikely, as you cannot pump this back to openvpn ..

can the result be written to file?

It is written to the openvpn log ..