@Sunshine The Ipsec VPN can be either site to site (router to router) and client to site. I have both work for 5 years with the Microtik router. Iphone native VPN doesn't support PPTP VPN any more...

@Sunshine Thanks for your reply. Actually, I want to access a device connected behind the MR400 remotely using VPN. But the problem is wan's IP is a private IP. Anyway, in case I can manage to get a...

@Sunshine I want to connect from Client(Iphone) to router.

I just realized that it might not possible for MR400 to be a VPN server as IP address from 4G is a private IP. Any solution? I've never tried openVPN. Does it work for my case?

@Sunshine I have MR400(EU) ver 4.2 with the latest firmware which has only PPTP. I want to set up either L2TP or Ipsec VPN so that I can connect my Iphone to the MR400. Do I need a special firmware ?...