I am working on setting up a VPN for our office. I have the PPTP version working but am unable to get L2TP to function. Through various testing methods (setting up our Mac Yosemite server as a VPN and testing it in and out of the office), I am leaning towards an issue with the router not allowing some of the protocols required by an L2TP through. The reason being I am able to create a L2TP VPN connection with my Mac server when using the internal IP address, but not when using the outside IP address (which to me means the signal is being blocked at the router.)
The server is receiving the SCCRQ from the client and trying to send the SCCRP which the client is not receiving when trying to connect from outside the office.
I have checked all the ports required and they are open (show ip ports), but can not figure out how to check for ESP Protocol 50? Does anyone know how to check this protocol? And if this isn't the solution, does any have other methods I can use to find the issue?
Thank you,
Chris
