I have a ADSL router with a static ip connected to a switch which is serving 48 PC's. The pc are configured to use DHCP from the router.. Some times some of the pc's show limited or no connectivity. I earlier thought that it might be a problem with the lan catd or the switch but when i gave static IP's to the lan cards it was able to comunnicate with the network properly.. but if i do that i cannot access the Internet. I think it has some thing to do with the router. We use utstar ADSL Router provide by the service provider.