pppoe wrong MTU size after swithing to bridge mode and mikrotik

RouterOS General
1

Hey, i have question regarding MTU size for pppoe connection.Before i put my ADSL router in bridge mode, i know i had MTU of 1492 (done a cmd test ping ) ping google.com -f -l 1472 etc for example.

Now after i mikrotik dials connection, i see MTU shows 1492 for 2 sec, than drops to 1480, while MRU in connection status shows 1492.On main window for MAX values i set both to 1492.

Also when i veirfy via CMD ping test, my real MTU is 1480 now, while it was 1492 before.

Anyone knows why mikrotik reads wrong value, or how could i force it to use 1492 MTU which i know works form my provider?

Metal 2SHPn bricked after software downgrade
2

What RouterOS version do you have?
There have been bugs like this but I think they are all solved now.

3

6,35RC42

4

Ok that is recent…
Maybe you can do a trace to see what is going wrong.
In my case I have MTU 1500 because the provider supports RFC4638 and the modem (Draytek 130) too.

5

Sorry, what exactly you mean by trace?

6

Tools->Packet Sniffer