What device can combine the 2 DSL lines we have. One DSL is used for internet access. The other for FTP service from the outside. We would like the LAN to be connected to one box which in turn is connected to the 2 DSL routers from different providers. The reason bein, if one DSL goes down other one is available for internet access, without manually switching the cables. A box(router?) with NAT and firewall would be good.
