DHCP relay agent

[donohoecompanies]

Our DHCP server is in the same network as our clients, so we don't need to use DHCP helpers. However, we're currently implementing a NAC system which resides in a different network, and for it to have property visibility we need to set DCHP relay on the switches so the NAC can see the DHCP requests.

If I setup DHCP relay on our core switch, will the original unicast DHCP packets still be sent through to our DHCP server, or will I need to setup a DHCP relay for our DHCP server as well?

Basically, does DHCP relay remove the original DHCP unicast packet and replace it with the DHCP relay packet, or does it show the unicast packet through and just adds the DHCP relay packet?

[Joseph W. Doherty]

". . . we need to set DCHP relay on the switches . . ."

These are L2 or L3 switches?

[marce1000]

 - Ref : https://www.geeksforgeeks.org/dhcp-relay-agent-in-computer-network/

 >...

   Relay agents receive DHCP messages and then generate a new DHCP message to send out on another INTERFACE

     This will imply that a local dhcp-broadcast will never be removed from the particular broadcast domain

 M.

[paul driver]

Hello
The client broadcast will reach the local dhcp server so it won’t need to use the relay however the relay will be used also however if the relay address isn’t a dhcp server then that won’t respond to client broadcast so only the local dhcp server will service the clients.