15 Feb
2002
15 Feb
'02
08:57
Elf,
When i set up any machine on my network, it picks up an ip number from somewhere, but not from my domain. I assume whatever port dhcp works on is open, allowing it to pick up an ip from an outside dhcp server. Which port/protocol do i block to stop machines picking up this outside DHCP server?
I am not sure whether dhcp is a routable protocol in the first place; if it is not, an outside machine can neither receive nor answer dhcp requests from your machines. AFAIK dhcp clients broadcast their subnet only. But why not use a port scanner to check for open ports and a network monitoring software to see where the answers to the dhcp requests come from? Regards, Roland