Sorry, my English language I was brought into such subtleties.

So I say - just add a blank GRE tunnel, and so many users with Mikrotik Router OS will be easier and more pleasant!

Hello. Very disappointed in Mikrotik Router OS is not supported by clear GRE tunnel (port 47) 8) . Your IPIP tunnel (port 4) is not supported in hardware Cisco. PPTP tunnel I do not fit (the technical requirements of VoIP provider Rostelecom) Now I have to throw out your Router board in the scrap-he...