Hi,

The other day I was transferring some files over my IPSec VPN. Normal traffic is 10-13Mbit (My internet capacity is at max 14Mbit). Now it was only 4,5Mbit and at max 6Mbit.
I checked the connections on both ends and got 100 Mbit down and 20Mbit up on the remote end.
My connection was delivering 14Mbit down and 2Mbit up.
So I could not find any reason what this was the cause of it.

I started debugging this and saw while I was transferring files the "in-state-sequence-errors" counter increased. Most often by a count of 2-5 at the time.
I did a test today and connected it to a different site. Same ISP but different customer. That site had a RB1100AHx2. Now I had 12Mbit and no "in-state-sequence-errors" errors.

The configuration has been the same on both sites. Only difference is updates on both Sophos side and Mikrotik side.
Mikrotik is running 6.1 and Sophos is v9 with latest patch.

Anyone got an idea what this could be?