Mailinglist Archive: opensuse-security (685 mails)

[Roland Salzburger <roland.salzburger@xxxxxxxxxx>]

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