RB450G, RouterOS 5.11
For good reason, I have assigned an MTU of 1432 to an interface in the RouterBoard, instead of the default 1500 (the interface is on an internal bridge). I can verify that this setting has been acted upon, because that interface now sends TCP packets with a maximum size of 1392 (=1432-40). All well and good.
However, when I send that interface a TCP SYN request, it responds with a SYN-ACK offering an MSS of 1460.
This seems wrong to me. It ought to be sending a SYN-ACK offering an MSS of 1392.
Is this a bug in RouterOS? Or is there a setting that I have missed?