tcp mss mtu oddity since upgrade

RouterOS General
1

hello all, just to say I found since upgrading to 3.10 from 2.9.51 we had a problem accessing paypal etc and soem secure sites.

We found that something has changed in mikrotik routing and we found to solve the problem we had to set the MTU on the actual interfaces at 1300 and then remove the old change tcp-mss rule in mangle to make it work??

Any ideas?? and is this likely to change again??

2

My experience was the exact opposite but hey…

I understand this whole MTU/MSS issue to be a TCP thing, so making the change on the actual interface affects ALL protocols, hence the need to create a mangle rule for TCP.

YMMV.