Thank you, wlm2, for posting your topology.
Your gateway router is a Linksys WRT610N. I don't own one, but I have reviewed the user guide at
http://homesupport.cisco.com/en-us/s...outers/WRT610N and have determined:
- This device cannot be operated as a bridge, and pass all packets transparently.
- This device can provide a port forwarding DMZ (all ports forwarded to a single address for just the TCP and UDP protocols), and can be configured to pass various VPN protocols (the suite of IPSec protocols, L2TP and PPTP).
- NAT can be disabled, so that the device may be used as in inner router on a private network.
- With NAT disabled, the device will accept RIP packets to adjust routing tables.
But ... it appears that the "Internet" connection on the back panel is an RJ45 socket. If so, this is a twisted pair Ethernet, to interconnect with an ISP's terminating equipment. Therefore device could be replaced by the ALIX entirely, once the ALIX and the inner network is configured properly.