I have an EoIP tunnel between a Mikrotik RB4011iGS+RM and a Mikrotik CCR1009-7G-1C-1S+PC device.
There is a "Clamp TCP MSS" option at the EOIP settings page in winbox. Even if I set it, I also have to add another "change MSS" (with 1250 MSS) rule under Firewall/Mangle to have properly working TCP connections via the EOIP tunnel.
Based on the documentation, I tought "Clamp TCP MSS" would be enough to turn on at the EOIP settings but this is not the case.
What do you think, can it happen this is a bug in RouterOS?
I would like to have small MSS (1250) only in the tunnel not for all the network.
I started to work on this as I found my tunnel too slow: I expected near to 1Gbps but it is just cca 100 Mbps. I tested it with samba file copy, apache http/https get request and scp copy. All with 20-25GB big file.
Thanks & br,