I had to do this recently when my ISP "upgraded" my modem/router/switch for the latest model (due to the old one dropping connection many times a day). The new one had a fixed subnet (192.168.1.0) which would have meant a lot of work to reconfigure all of my systems to use that. So I put the modem into "modem mode" where it just does a straight pass-through of all traffic and bought an external router. Performance isn't as good for some reason, but at least I have control of my internal IP addresses and various other features that were fixed (broken) when running in "router mode".W. H. Heydt wrote: ↑Sun Apr 22, 2018 4:56 amNow all of that said, one of the features o the typical broadband modem with a built-in router and switch, is the ability to "bridge" the "router". That is just turning off all routing activities and making it a simple pass-through device...a bridge. If a facility has a fixed block (usually a static one), then one can connect a switch to a bridged router, assign the devices static IP addresses, and then you have direct, public routing. The more common arrangement is to bridge the ISP_supplied "router" (really a modem-router-switch) and connect your own router to it. That way, you can have a router under your full control at all times, instead of one that may have hidden "features" that you don't want and can't turn off.
It was stated in the other thread that a Pi could not be a router. This is clearly not true. It can route packets between networks connected via Ethernet, WiFi, serial (SLIP, PPP), all manner of other connected interfaces. And perform all kind of other functions that routers are expected to perform now a days.A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. A data packet is typically forwarded from one router to another router through the networks that constitute an internetwork until it reaches its destination node.
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