thank you for your reply @hamster. It does not work for me for mac clients in the same nat. I will continue to test configurations.

Hi,
I'm new to mikrotik ipsec/l2tp, and I'm a bit confused. One question:
Two or more clients in a hotel (same ip) trying to connect to a mikrotik router with public ip.
Will it work fine If they are mac computers (random ports)? Will not it work if they are windows (same port)?