It makes sense. Seems that there was a DHCP server around in the network ...is the only reason i can think of for this happening. So If i connect a home router (linksys WRT54G) It can serve as DHCP...

Model : Hardware Version : Firmware Version : ISP : Model : TP-SG1048 Hardware Version : Not Clear Firmware Version : v6 ISP : none I connected 20 computers to the switch. Nothing else (nor router,...