How to detect DHCP server in a LAN under a Ubuntu linux client

Hello friends

As I remember, there is tool called dhcpd-test in Suse Linux, it can detect the DHCP server in LAN, but I don't know what it is under Ubuntu. Can anyone tell me there are some tools can be used for detecting DHCP server in LAN under Ubuntu?

one way is to use sniffer tool such as tcpdump or wireshark, then send a DHCP request.

use a network tool such as nmap

for example :
# nmap 192.168.1.0/16 -p 53

(port 53 is dns)

Do you want to find out the IP address of the DHCP server that granted your computer a lease or do you want to scan the network for DHCP servers?

Originally Posted by catkin Do you want to find out the IP address of the DHCP server that granted your computer a lease or do you want to scan the network for DHCP servers?

Hi catkin,

That is what I want to know , do you know some similar tool like dhcpd-test under Ubuntu? so I　can detect how many dhcp server working in the LAN.

There's a solution at http://www.unix.com/ip-networking/17...-discover.html