Problem with devices releasing and renewing leases too frequently

Frank Bulk frnkblk at iname.com
Sun Dec 9 18:41:06 UTC 2007


This has been documented most often on Roger's network.

http://www.dslreports.com/forum/remark,16717263
http://brainwreckedtech.wordpress.com/2007/07/01/review-belkin-f5d7230-4-wir
eless-g-router/#comment-191
http://www.ellenroseman.com/?p=58
http://www.tribemagazine.com/board/showpost.php?s=4d87c0de25c923a2975962ae8a
533a3b&p=3326298&postcount=7

Regards,

Frank

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
Of Brian Raaen
Sent: Monday, November 05, 2007 9:11 AM
To: dhcp-users at isc.org
Subject: Problem with devices releasing and renewing leases too frequently

I have a strange problem on a few cable networks that mainly involves Belkin
devices.  A cpe device with do a complete dhcp transaction
(discover/offer/request/ack) and then after it has accepted the addres it
will issue a dhcprelease and repeat the cycle.  The frequency of
dhcpreleases
is in the range of every 22 seconds for some devices.  here is a list (most
logs only span 24 hours) of the amount of releases along with the OUI's.

34252   00:17:3f:xx:xx:xx
13800   00:11:2f:xx:xx:xx
886     00:1b:24:xx:xx:xx
349     00:13:72:xx:xx:xx
349     00:0f:b0:xx:xx:xx
92      00:17:bc:xx:xx:xx
41      00:11:50:xx:xx:xx

Doing a firmware update on one router resolved this issue.  I was wondering
is
anyone else was seeing this.  We first noticed it while tailing the dhcplog
troubleshooting a different issue.  We saw a large amount of repeated
releases from the same mac address, and investigated further.

--
Brian Raaen
Network Engineer
braaen at zcorum.com
Tel 678-507-5000x5574




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