Every morning I open up the DHCP console to looking for unknown computers connecting to our network. I know that every device that is part of our domain list the computer name as computer_name.domain.net. When a computer shows up with a DHCP lease without the .domain.net part of the name I look to see if what device it is and if it is authorized to connect to our network. I know that device is not a member of our domain. We do have a Linksys AP that is secured using WEP. I know WEP is not the greatest. Also, we use Microsoft ISA 2004 server as our firewall. Now the Linksys AP is connected directly to our switch. Is that bypassing ISA? Can a computer get an IP lease from DHCP without being a domain member? Does the server require Authentication before assigning a DHCP lease?