Pretty weird problem I discovered recently.
We use the VPN Client to connect to a 1841 router. Everything works fine except for one small thing.
The client do not send out _any_ traffic if the destination is the ip-address of the DHCP-server the client got its original ip-address from.
This is verified by Wireshark. A ping on the client do not produce any ESP packets towards the VPN concentrator. No matter what traffic you try actually.
Discovered this when wanting to use Remote Desktop towards the Windows Server that is the local DHCP server and was not able to connect. Then tested ping and still no response. That made me look closer and found out that I could not communicate at all with the DHCP server.
As I said, pretty weird.
Anyone else have seen this? Anyone have a solution? Right now I use OpenVPN instead when I need to control that server.