Multiple DHCPREQUEST/DHCPACK logged for a single DHCPtransaction. Anyone seen this before?

Frank Sweetser fs at WPI.EDU
Fri Nov 16 14:47:57 UTC 2007


Steve van der Burg wrote:
> Does anyone know if this indicates that my network is messed up somehow?
> Servers are a partner pair running ISC DHCPd 3.0.5.  Network is quite
> large, and I don't run or configure it.  I've always wondered about the two
> incoming gateway(?) addresses on the requests (.250 and .251).  Our
> official router gateways are all .254.

You'd have to ask your network guys to be sure, but this looks like you have
two physical routers, .250 and .251, which are configured as a logical pair
using VRRP, with .254 configured as the logical router address.  The two
routers have a master/slave failover relationship for forwarding traffic, but
each one still runs its own independent DHCP relay agent.  We have a
configuration like this here, and other than larger logfiles, everything works
fine.

-- 
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
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