Problem with devices releasing and renewing leases too frequently

[Brian Raaen]

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