Want to bridge two wired ethernet connections

I have a Core Duo based Mini that was just replaced with a new aluminum MacBook. I am going to re-purpose the mini as a media center device. I already have a TiVo HD unit hooked up to the same TV. The TiVo is hooked up through a wired ethernet connection, to better support streaming and the transfer large video files. Due to the visibility of the location, I would prefer not to place a hub there, and I would prefer to avoid having an extra power cord around for a hub.
I'm considering getting a USB ethernet device. Then I can connect the TiVo box to the internal ethernet port (en0) and connect the usb ethernet port (en1?) to the remainder of the network. I would then bridge the connections. Note that routing is probably not sufficient, because the other TiVo units would not detect the one on the different network. I need a bridge, which would allow all the TiVo units, including the one behind the Mini, to be on the same network and discover each other via broadcasts.
This is normally a fairly trivial thing to set up within a unix environment. I can find tons on information on how to do it in Linux. But I cannot find any info on doing this within Mac OS X.
Also, where can I find information on USB ethernet devices supported within OS X?

GdayBruce,
Even though you don't mention it, I am assuming that somewhere in this gordian mix you have a router. Beyond that, I cannot fathom what it is you are trying to do here. You may be making things way more complicated than they need be.
I think I get that you want to connect the Mini to the network (what network, though, and created by what device??? How many "networks" are there, and what are their purposes?), then connect the one and only TiVo unit you mention to the Mini, using the Mini as a "bridge."
OK, let's just start this whole thing over. You need a router. Full Stop. One router. Full Stop. That router will be connected, no doubt, to some type of modem (cable or DSL) of course, and everything else will connect to it, either wirelessly or via ethernet. One router, one network.
Now, one way to avoid having to route cables all over the place in order to connect devices via ethernet is to create a wireless network and use additional wireless devices as "bridges." THese devices would be configured to connect to the wireless network, then provide a wired ethernet connection to that wireless network. In other words, they "bridge" the two. Older Airport Express units could bridge ethernet to wireless, but no the other way around. I'm not sure if the current AEs can bridge wireless to ethernet (they might, but I'm not sure).
Scott

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