On 4/26/25 5:46 AM, Jonathan Billings wrote:
On Apr 26, 2025, at 00:24, David King <dave@xxxxxxxxxxxx> wrote:
As to firewalls:
Plugging the workstation directly into the Comcast cable modem puts your computer directly on the internet, where everyone can hack away at it trying to break in. I always put some sort of router in between the cable modem and my computer. They're available for cheap and are usually plug-and-play. The router connects directly to cable modem, i.e., the internet, and gets a public address while the workstation connects to a private local intranet created by the router. Nothing on the workstation can be accessed from the public internet unless I specifically change the router's configuration to forward ports through it to my workstation. In the situation you described there would be no need to do such a thing. When connected in this manner the computer can see everything on the internet, but nobody on the internet can reach the computer.
As a Comcast customer, it’s actually a pain to get a modem that is just that. Most consumers get a modem/gateway/wifi AP by default, which should put the user behind an ipv4 NAT. However, it usually also gives you a public ipv6 address. So you need to be extra careful about it, and not assume that since your comcast gateway put you on a NAT that you are safe. Comcast does block a lot of services with the non-business accounts though.
So if you add another gateway, be aware that you will likely be double-NAT’d.
I neither rent a comcast modem nor bought one from comcast. I bought my
modem (an Arris) on-line.
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