i made the MTU-Test in OpenVPN to optimize the tunnel.
I used the wiki page wiki.ipfire.org - Troubleshooting
with the chapter MTU-Test.
In this test the value is suggested by OpenVPN to 1253 to what can be achieved if 1253 will be written into the “fragment” line into the web-interface, also mssfix should be activated, the actual MTU value can be left in 1500.
My Test Results
NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[1700,1604] remote->local=[1684,1636]
What is the correct value for the optimal MTU ?
With the example iam not able to understand the result
NOTE: This connection is unable to accommodate a UDP packet size of 1700. Consider using --fragment or --mssfix options as a workaround.
I can use the Value direct as MTU Size or / and as fragment (MTU 1500 + Fragment X)