acidrop

Hello I have the following scenario: 2 sites A and B each side has 2 adsl lines with static ips 4 draytek vigor 2700g routers (2 on each side) I want to utilize 2 different site-to-site IPsec VPN tunnels. Site A: --------- Vigor #1 config: ------------------- ip address 192.168.1.1/24 lan subnet 192.168.1.0/24 Vigor #2 config: ------------------- ip address 192.168.2.1/24 lan subnet 192.168.2.0/24 -------------------------------------------------------------------------- Site B: -------- Vigor #3 config: --------------------- ip address 192.168.3.1/24 lan subnet 192.168.3.0/24 Vigor #4 config: -------------------- ip address 192.168.4.1/24 lan subnet 192.168.4.0/24 ----------------------------------------------------------------------------------------- I have successfully established VPNs between Vigor1 <-> Vigor3 and Vigor2 <-> Vigor4 I can ping from router each site sucessfully. ------------------------------------------------------------------------------------------- On site A there's a win2k3 server with Terminal Services enabled. I have configured its network card with the following ip addresses: 192.168.1.5/24 192.168.2.5/24 default gateway: none 2 static route mappings: route add 192.168.3.0/24 gateway 192.168.1.1 route add 192.168.4.0/24 gateway 192.168.2.1 --------------------------------------------------------------------------------------------- On Site B there is another Win2k3 Server with the following config on its network card: IP addresses: 192.168.3.5/24 192.168.4.5/24 default gateway: none 2 static route mappings: route add 192.168.1.0/24 gateway 192.168.3.1 route add 192.168.2.0/24 gateway 192.168.4.1 --------------------------------------------------------------------------------------------------- When i try to ping from the server on Site A server on site B at ip address 192.168.3.5 i can get reply. When i try to ping from the server on Site A server on site B at ip address 192.168.4.5 i can also get reply. The problem is that after some seconds server on Site A stops get ping reply from Server on Site B at ip adddres 192.168.4.5. The same happens with server on Site B when tries to ping server on Site A at ip address 192.168.2.5. -------------------------------------------------------------------------------------------------------------------- First of all is it possible to to have 2 different VPNs between 2 sites with 2 servers with 1 nic on each server configured with 2 different subnets? Is there a routing issue? Do i need 2 nics on each server to achieve this? Thanks for any answers and sorry for any misunderstanding...