Hello.
I have two MikroTik routers with IPSEC channel between them. I run btest server on both of them. I am able to connect from btest client of first router to a btest server of second router by external IP (PPPoE), but I am not able to do it by its internal IP (which belongs to 'bridge' and available via IPSEC channel). I pass all IPSEC traffic via Raw 'no track' rules, if this matters.