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DHCP Servers

I am trying to figure out which servers on the network are acting as DHCP servers. Then I would like to stop them from being DHCP servers and have the pfSense server be the DHCP server. All the servers run Linux (Debian I think), and are of course outdated versions. Please help me to do this. What is the first thing I should do and how?

EDIT: Nevermind, found out by doing pgrep dhcpd on all the servers via SSH.


  • Great that you found the solution. Keep us posted if you any other issues.
  • Is it possible to write a tutorial about how you can find dhcp servers on your network? Will help users who encounter the same issue.
  • mfillpot
    mfillpot Posts: 2,177
    I told him the answer in private, the solution is to scan the entire network with nmap, nmap will display all services that are being run on each host.
  • whenever a broadcast packet is sent by a box request for an IP, a DHCP server a resonse acknowledging the request. Any packet sniffing tool like tcpdump or wireshark can capture those packets and report about them. So if u could write a script to chk those we hav a monitoring script in place to find unsolicited DHCP servers in your network...


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