Sorry for the slightly OT..... Is there anyway to test which MAC addresses are being seen outside a NAT device such as a dual honed Win2K server? We have a Win2K box acting as a Router/Bridge and DHCP server. One NIC is connected to the Internet (WAN side) and the other to our network (LAN side). It works well. However, is the anyway to test easily that our LAN side host (computers, servers, etc.) MAC addresses are not seen on the WAN side? In other words, We want to test the NAT function that the translation does not reveal the number or type of LAN side host we have to the Internet WAN. This question could be asked of any router that provides NAT. Eduard L. Frerking Capt. Jason M. Dahl School San Jose, CA elf@xxxxxx