Wildly excessive DHCPREQUESTs

Frank Sweetser fs at WPI.EDU
Wed Feb 20 02:56:20 UTC 2008

John Hascall wrote:
> We have a number of machines here which are making a stupidly
> high number of DHCPREQUESTS (and DISCOVERS in some cases).
> For example, we have a few dozen machines making in excess of
> 1000 REQUESTs per day.   The worst seems to be an XP box making
> about 11,000/day.  Does anyone have any idea what might make a
> box do a DHCPREQUEST/ACK cycle about every five seconds all day,
> day after day (despite getting a 4 day lease)?

We've seen a number of versions of dhcpcd blast out requests like that, but XP
boxes have typically been well behaved.  You may want to check for a rogue
DHCP server on those subnets handing out conflicting information and confusing
the XP clients.

Frank Sweetser fs at wpi.edu  |  For every problem, there is a solution that
WPI Senior Network Engineer   |  is simple, elegant, and wrong. - HL Mencken
    GPG fingerprint = 6174 1257 129E 0D21 D8D4  E8A3 8E39 29E3 E2E8 8CEC

More information about the dhcp-users mailing list