Constant DHCP requests...

Frank Bulk frnkblk at
Tue Aug 2 01:36:51 UTC 2011

What device is this?  We continue to see issues with Belkin routers in our
SP network.  A firmware upgrade usually resolves the issue.


-----Original Message-----
From: at
[ at] On Behalf Of
Jeff Justice
Sent: Sunday, July 31, 2011 7:52 AM
To: Users of ISC DHCP
Subject: Constant DHCP requests...

I know this list is for the ISC DHCP, but I am having a DHCP problem that I
was hoping someone could shed some light on.

I have a device that hooks to our network that gets its address via DHCP.
When it is first powered on, it sits there for anywhere from 5 to 20 minutes
without a problem, but then the network light starts flashing constantly.

I ran a Wireshark trace and discovered that I was getting a constant stream
of DHCP Requests from the device followed by the router sending an ACK.

What led me to ISC's DHCP was that I thought I would install it on a server
on our network, turn off our router's DHCP to see if the problem changed.
It didn't.  I am still getting flooded with the DHCP request/ack.

I have had a conversation with the device manufacturer who says they can't
find any problems with their device.  They sent me a replacement which has
the same problem.

This leads me to believe that there is something in the programming of the
device that isn't handling the DHCP server's response correctly, or there is
a problem with my network or maybe even a switch?

I'm not sure what steps to take at this point to solve this.  I can't put
the device in production until I have figured out the cause.

Any ideas?

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