R: R: Relay agent with dhcp server on same subnet

Bruce Hudson Bruce.Hudson at Dal.Ca
Wed Nov 18 21:44:46 UTC 2009

> I think server nakew client request because there isn't any
> agent.circuit-id field in its packet.

    You are correct. Your switch is acting as a DHCP relay but it does
not appear to be suppressing the original broadcast DHCP packets. This
means your server is seeing every request twice: once directly from the
client without relay information and one via the switch that includes
the relay option. 

    The direct DISCOVER would have generated an error message in the
server's log that no addresses were free and dropped. However, the
direct REQUEST generates a NAK.

    This is probably a configuration error in the switch.
Bruce A. Hudson				| Bruce.Hudson at Dal.CA
ITS, Networks and Systems		|
Dalhousie University			|
Halifax, Nova Scotia, Canada		| (902) 494-3405

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