I have a Windows Server 2003 machine with dual NICs. Until now we've only had a single ISP provisioned by our landlord in the building and have only been using one NIC. Filezilla is the FTP server.
We've had a long standing issue with a client who needs to use a very specific VPN setup provided by an ancient Cisco router. Trouble was this router refused to co-exist with some other clients' VPN settings, meaning we frequently had to swap cables to bring the old VPN in and out of action.
This, as you can imagine, got very old.
We've got a new ISP which is dedicated for us and the plan is to leave the Cisco VPN running on the old ISP and move all other clients over to the new connection. The thinking being we would run the office network on a separate subnet off NIC 1 and leave only the Cisco VPN connected to NIC 2. Running two instances of Filezilla binding to specific NICs should allow FTP to be provisioned on both internet connections.
This all works fine and both FTP servers are accessible from the internet...providing only one is active at a time. As soon as one is connected the other server can't be reached.
I can see how the server might have trouble routing to two external connections, deciding which gateway to use and what not, but I'm pretty much at my knowledge limit about such things so don't know where to turn next.
Do I have to look at defining routing within Windows (RIP?) so that it can route to both gateways simultaneously?