Router : C891F (1 Gigabit L3 port and 8 switch ports)
It's probably easy but I don't know what's wrong. To put you in context, I configured a router out of the main LAN and everything worked except that 1 computer was stuck with an APIPA address while another plugged in the same port recieved DHCP no problem.
After work hours, I plugged the organization's unmanageable switch into the port that had been configured for that switch but Nothing (yes, the config has been saved before turning off the router). Everything gets an APIPA address. I rebooted the router and access point, no change. I rebooted the computers, no change. Rebooted the switch, no change. I set up static IPs, now I can connect to the management interface but still no internet access and anyway, I want DHCP to work, not set static IPs everywhere. I had already tried the router on the real network and it worked fine so I Wonder what's the problem.
Does it have to do with the DHCP lease time? Does it have anything to do with the client MAC address? Is the computer refused DHCP or is it just unable to communicate with the server (which worked before I moved the router)?
Is the server trying to remember computers or Something? Can I prevent this?
