AnsweredAssumed Answered

VPN over L2TP/IPsec

Question asked by Chris Sanger on Jan 25, 2018
Latest reply on Jan 29, 2018 by Douglas Labun

Hi All, We've spent the last several months setting up PDM Pro (after upgrading from standard) over VPN. It has been a learning experience to say the least. After spending a not-insignificant amount of time and money I finally have the thing up and running reliably. My site to site VPN was dead simple using Ubiquiti hardware and OpenVPN.


I finally got my client to site VPN's stable yesterday after switching to PPTP from L2TP. We had tons of stability problems with L2TP/IPsec. Basically, the client would disconnect when trying to pull down large files, 5mb+. If they tried to pull down latest on an assembly larger than that it was a crapshoot if it was going to work. If there were any reference issues the connection would drop 100% of the time. It was definitely a client issue but even after clamping down MTU size to 1370 as determined by a quick ping test to set fragmentation to zero, it was still dying.


After switching to PPTP, no issues. At all.


But, I don't want to use PPTP for security reasons. Has anyone out there had success with running a vpn over L2TP? Any advice on areas of my network to check for why PPTP works but L2TP doesn't? Or does PDM just not cooperate well with L2TP because of its sensitivity to piled up packets?


Thanks in advance. Chris