MikroTik IPSEC behind FritzBox Router

Configure the Fritzbox to passthrough IPSEC ESP and UDP ports 500(ISAKMP) and 4500(NAT-T) 1. Configure the FritzBox that it allows incoming and outgoing connections for the following ports and IP protocols to your MikroTik Box/CHR : ESP (“Encapsulated Security Payload”; IP protocol number 50 (no ports here!)) in most routers this is = “IPsec Passthrough”…