I have a problem with a three sight VPN configuration. I use three routers (one Cisco 3640 and two Cisco 1720). I can´t connect to the Ms Exchange server behind the Cisco 3604 from the two Cisco 1720 sights. If i remove the static IP assignment applyed for the Ms Exchange server in the Cisco 3640 it works. How should i configure the routers... with the static included in the config?