this post was submitted on 07 Sep 2024
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I mean, it’s all right there in the first two paragraphs. Keep in mind that by DHCP server we aren’t talking about something specifically set up by people with malicious intent. A home router is a DHCP server when not configured for pass through. Students who don’t know how routers actually work (we can’t all be IT nerds, lol) plug them into their dorm Ethernet jack, and now you’ve got an unauthorized device offering IP addresses that conflict with the authorized DHCP servers, which can quickly start causing issues with any new devices trying to connect to the network, and existing devices as their DHCP leases expire. Also keep in mind that we’re talking about a college network that will likely have local network resources for students like shared drives that would not be accessible to anyone connecting through the rogue device. Your IT department will quickly start getting complaints about the network that are caused by an access point you have no control over.
I see, I thought routers knew not to do dhcp on the Wan port
They do know enough to not send DHCP leases upstream..
If you plug the dorm ethernet jack into the LAN side of a consumer router, there's a chance they don't.
Sure, you can catch this if you watch the dhcp leases your router is handing out, but..
I'm assuming OP is at least smart enough to know that the port that's on its own/a different color/somehow different from the others is the one that goes into the wall. It sounds like they have at least that level of competence.
I’m sure OP is given the more technical nature of Lemmy users. But this thread is about the average college student with no networking knowledge.
ETA: Sorry that I specified you weren’t talking about the same thing the rest of us were in this thread.