IPSec Tunnel fails –-
I have a pfSense 2.0.1 with two IPSec tunnels.
Tunnel one is to a pfSense 1.2.3 while Tunnel 2 is a pfSense 2.0.1 box.
Tunnel one stays up and seems to be fine. Tunnel 2 keeps dropping Putty sessions on what appear to be Large Packet errors. I changed the WAN MTU on the Tunnel 2 end from default (1500) to 1486 but it failed again just now. Putty error: "Software Error Connection Aborted"
Any ideas ?
On pfSense 1.2.3, the "MTU" value on WAN actually set MSS Clamping (assuming you didn't disable scrub).
The equivalent setting on 2.0 would be under System > Advanced, on the Misc tab, check the box for MSS clamping on VPNs and then enter the same value there that you enter on the 1.2.3 box's WAN MTU.
Leave the MTU on pfSense 2.0.x as default.
It should match on both sides.