OK, I have an odd issue and was wondering if anyone here had any insight.
I have an 1841 router at our main office that serves as the local endpoint for our L2L IPSec tunnels. For 12-14 months now it has had 3 tunnels coming into it.
I recently replaced the PIX 501 at my home (which had a L2L IPSec tunnel to the 1841 for almost a year with no issues) with a Cisco 877W router. I deleted the old tunnel and recreated the tunnel between the 1841 and my 877W.
Here's where the weirdness starts. I have the tunnel up and can ping across, but when I initiate an RDP connection to any machine at the office the connection times out before it can be built. This also happens with ICA connections. I am sure that routing is configured properly as I can ping the machines with no issues, as well as hit the HTTP servers running on them, I just can't do RDP or ICA.
I did some research and thought that it might be an issue with MTU getting large packets dropped, so I did a ping test with the DF bit set and kept increasing the packet size until they dropped (maximum packet size was 1399 bytes). Then, I applied the ip tcp adjust-mtu 1392 commmand to the Vlan1 and Dialer0 interfaces on my 877W as well as the Fa0/1 and Fa0/0 interfaces on the 1841. Still no dice.
Does anyone know why this might be? With the PIX 501 I had no problems with RDP or ICA.