DHCP issue

muhmdaltybe · ‎07-20-2022

guys, please help me !! I have an unknown DHCP server in my network (192.168.0.1) I think someone connects his own personal router to the company network, it really gives me hard times anyone can tell me how I can locate his port in the switch so I can disconnect him?

marce1000 · ‎07-20-2022

- You need DHCP snooping feature(s) to prevent unwanted dhcp services on the network : https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_52_se/configuration/guide/3750scg/swdhcp82.html#wp1058138

To find or block unwanted check : https://www.youtube.com/watch?v=uyvEa7Nh80A

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

MHM Cisco World · ‎07-20-2022

you do half of Job
open the packet in wireshark
check the source mac of packet/frame
show mac-address table
see where this mac appear in which port.