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Math TecFlag for United States of America

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Deny unauthorized DHCP server in the network

Hi,

I have two DHCP servers running under windows server 2016. My question is how can I deny any other unauthorized DHCP server in the network? The server are connected to Cisco 9300 switch then to core switch 6807

Each server has two LAN's with an IP address
Server1
192.168.0.248
192.168.0.249

Server2
192.168.0.250
192.168.0.251

Thanks
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Dr. Klahn

Symantec has a tool which may be helpful.

https://community.broadcom.com/symantecenterprise/communities/community-home/librarydocuments/viewdocument?DocumentKey=e37dd769-ce18-488b-b188-fbacffd7d76a&CommunityKey=1ecf5f55-9545-44d6-b0f4-4e4a7f5f5e68&tab=librarydocuments

"Find DHCP displays the DHCP servers active on your network, just run this portable tool and in few seconds will be shown many helpful information such as IP address offered by dhcp server, netmask, gateway, servers network address and dhcp lease.  You can use this freeware tool to discover rogue DHCP servers or just for a quick check on your network."

You can then go hunt the device down.  As far as forbidding unauthorized DHCP servers automatically, I am not sure it can be done.
Avatar of Math Tec

ASKER

Hi,

Thank you for your reply, I do believe I can do that with DHCP snooping. However, I do not know how to do that

Any suggestion?

Thanks
ASKER CERTIFIED SOLUTION
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kevinhsieh
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