Answers

Modem muddles

 Q I live in the US, and I had to upgrade my modem to one supporting DOCSIS 3.1 to access the faster speeds from my cable provider. I have two Linux Mint PCs and two Windows 10 PCs. After changing modems, the Windows PCs would connect to the internet, but neither of the Linux PCs would. I tried two different modems: an Arris SB8200, and Netgear Nighthawk. I called support to my ISP, and the modem manufacturers, but nobody could help. I was never able to get the internet to work, so I had to put the old modem back. After doing that, everything started working again. I kept the Arris modem, just in case someone could figure it out.

Larry

A Looking for the Arris at the modem documentation , it should work. The manufacturers state that Linux is supported, so this is likely to be a configuration issue. One point to bear in mind is that although the modem has two Ethernet ports, you can only use one of them unless your ISP is providing you with two IP addresses, because this is only a modem and not a router.

These devices usually use DHCP to assign an address to a connected computer and to provide it with routing