I have multiple PCs connected to a router with static IP. The Ipv4 & default gateway set up is 192.168.10 but some PCs that were on 192.168.10 have changed to 192.168.1. Not all but some. On the PCs that changed, I removed the ethernet cable and plugged it into another PC and that PC gets the original Ipv4 & default gateway. So how do I change back the PCs to the original Ipv4 & default gateway?