Clients keep sending DHCPDECLINE

Tom Schmitt TomSchmitt at
Mon Aug 23 07:45:20 UTC 2010

-------- Original-Nachricht --------
> Datum: Mon, 23 Aug 2010 09:28:08 +0200
> Von: moffe at
> An: Users of ISC DHCP <dhcp-users at>
> Betreff: Re: Clients keep sending DHCPDECLINE

> Hi all
> Could this be caused by a network loop? I also get multiple ARP replies
> in many cases like eg. this:
> 06:21:43.585145 arp who-has tell
> 06:21:43.585288 arp reply is-at 00:23:df:f9:3d:74
> 06:21:43.585755 arp reply is-at 00:23:df:f9:3d:74
> 06:21:43.586362 arp reply is-at 00:23:df:f9:3d:74

Yes, I do think that could be the source of your problems. If you have a problem in your routerconfiguration (like two HSRP-interfaces, both acting as active) or someone else in the subnet, acting as a router (maybe via wlan), then some traffic can easily getting multiplied.

This could explain the DHCPDECLINES:
The client is sending it's ARP request to see if someone has this IP already. Through the network-loop the client is receiving it's own ARP-request and interprete it in a form, that someone seems to claim this address, so it will be in use in short time. Ergo the client is sending the DHCPDECLINE, hoping to get an answer were nobody else is claiming the IP.

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