Intentionally top posting: Thanks to all who replied, I got the Arris DG2470A modem (/ router) working in bridge mode with my existing router (Ubiquiti Edge Router X).
I made a dumb mistake -- I had my router and another computer plugged into the Arris (I used the other computer to configure the Arris), and then I switched to bridge mode. At least once I noticed that I could ping the Internet from that other computer, which meant that the Arris was in bridge mode, but that computer was using the Arris modem instead of my router. Since then, I've done better -- e.g., configured the Arris to bridge mode, then powered down the Arris, unplugged that other computer, plugged in my Ubiquiti router and configured it to connect to the WAN by DHCP. Aside: In my previous (DSL) installation, the modem was a modem only, and had only one place to connect an Ethernet cable. With the Arris, being a router as well as a modem, it had 4 places to plug in an Ethernet cable, and, without thinking about it, I plugged in two devices (a computer and the Ubiquiti), but, in bridge mode, only one of those was going to work. Sometimes I feel like an idiot. All seems well. On Friday, April 28, 2023 11:08:45 PM David Wright wrote: -- rhk | No entity has permission to use this email to train an AI.