I'm trying to get good, clear definition of what "Router Mode" DOES. Not "How to use it in this, that or another situation?" just "What does it DO?" I have some beliefs but they only go part of the way: - The opposite setting "Gateway" mode means NAT. - "Router" mode means NO NAT. I'd rather expect that, other than that, there would be no difference. Some people suggest that turning on "Router" mode turns the device into a "Bridge" but I don't get what they mean. Surely there is a routing table involved in "Router" mode, eh? Is there any good, clear definition of what "Router" mode does? The documentation just says something like "use Gateway mode if this is connecting to the internet and use Router mode if there are other routers on the network". Wow. "Other routers on the network" could mean just about anything!! I have one setup chaining RV042s from LAN to LAN to LAN to a gateway and to the internet. There are actually 3 sites with a private link that go like this: Site 1 to Internet Site 1 to Interim LAN to Site 2 Site 1 to Interim LAN to Site 3 Site 2 to Interim LAN to Site 1 Site 2 to Interim LAN to Site 3 Site 3 to Interim LAN to Site 1 Site 3 to Interim LAN to Site 2 There is an RV042 at each end connecting the interim LAN to the local LANs at each end. The two RV042s are in Router mode and entail added routes. Yet, it seems that these routers are not fully "bi-directional". The internet access for Sites 2 and 3 go through Site 1. They both have their WAN side on the Interim LAN. BUT if the same orientation is used for the RV042 at Site1, with the WAN on the Interim LAN, the system doesn't work. The WAN on the RV042 at Site 1 has to be on the Site 1 LAN and the LAN on the RV042 at Site 1 has to be on the Interim LAN in order for this to work. So, this implies it's not a bi-directional device even in "Router" mode. I think I'm missing something pretty basic here and maybe the one thing is a "bug" but I'd really like some help understanding what the "Router" mode is supposed to do in terms of function(s).