I have two RV042s, one in the office and one in the field. The WAN1 port of the office RV042 is connected to my fast but unstable internet connection, the WAN2 port is connected to a much slower but stabler DSL connection. I have the router setup to failover to WAN2 when WAN1 fails, and that has been tested to work. One problem with the DSL connection is that they filter SMTP requests unless the request is to their own SMTP server. I'd like to route all internet traffic from the office through a tunnel to the field when the DSL line is active, so those SMTP requests will actually get through to the appropriate SMTP servers elsewhere. Is this possible? How would I do it?