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Router is connected to Computer A (stepdad's PC) and Network Switch
Network Switch is connected to Computer B (my PC) and Computer C (sisters' PC)
It's only like this because of the new router we got, from which stems my problem.
I need to get Steam to run. In order to do that I need to forward ports, but for THAT I need a static IP. I set one up for Computer B last night while A and C were switched off and things worked fine.
Today my stepdad tried to forward ports from Computer A, using the static IP I'd set up. I switched on Computer B to check if it'd worked and couldn't get a net connection. Computer C couldn't get one either.
Switched Computers A and C around so A was attached to the switch and C was attached to the router. That made A unable to get a net connection but C could.
Removing the static IP on Computer B and putting it back to dynamic IP, and then rebooting, fixed everything.
My instinct is that the problem stemmed from only Computer B having a static IP. I think giving each PC its own static IP might solve things but I want to be sure before I try anything.
tl;dr: If one PC on a network has a static IP do they all need one?