Re: DHCP, dual NIC, DHCP failure

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From: KM (konstmor_at_nospam_yahoo.com)
Date: 02/28/05 

Date: Mon, 28 Feb 2005 14:58:50 -0800

Roger,

I was actually focusing on that hardcoded value in the DHCP client that is responsible for the retry getting the IP if the initial
attempt failed.
Although it is not exactly what you are trying to resolve but, I believe, it may be a part of the problem.

I think only one who has access to the sources code of the DHCP client may be able to help you figure out (and fix) the actual
algorithm of the IP handshake implemented on XP.
Let us know here if you get interesting replies in other newsgroups on the issue. 

-- 
 Regards,
        KM
> KM,
> > > I can reproduce this problem with XP Pro however the timeouts are much shorter.
> > > I get typical 1st retry timeouts of 16 seconds and 2nd try timeouts of 33 seconds.
> >
> > Are you sure about these numbers? A long time ago I observed different numbers on NT and 2K.
> > Are you testing this with DHCP server disconected? (that is how I'd test the retry interval)
>
> I am testing with the DHCP server connected.  Remember that I am describing a
> problem that I consider to be a Windows DHCP client bug because the server is
> doing everything it is supposed to do but the client is giving up on the
> protocol, timing out, and restarting the protocol.  About 50% of the time this
> results in my client not having IP addresses for 6 minutes or more.  Whatever
> the timeout is when the server is not connected may be interesting but it is a
> different problem.  If you want to see the details of this problem as it
> manifests itself in XP Pro then see my posting today in another NG:
> http://groups-beta.google.com/groups?q=dhcp+offer+ignored+-+ethereal+trace
> This posting demonstrates the same problem I have with XPe but the timeouts are
> much shorter.  I'd be glad to send the actual Ethereal files to anyone who is
> skeptical or who wants to help solve this issue.
>
> > > Is it likely that different hardcoded values would be put in XP Pro
> > > and XPe?  If yes, why?
> >
> > I doubt that. We all know the XPe binaries are coming from XP Pro and therefore the hardcoded values are the same.
> > Only difference I can imagine is in the SP level. You didn't mention what SP of the XP Pro you tried but I suspect it is either
SP1
> > or Sp2.
>
> Everything I've posted about pertains to SP2 but I've verified that the same
> problem exists in SP1.
>
> Roger

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