XP clients sometimes ignore DHCPOFFERs

Jeff Wieland wieland at purdue.edu
Thu Mar 16 17:51:37 UTC 2006

I'm wondering is this relates to the release-on-shutdown option, option
code 2?  We implement it like:

option space MSFT;
option MSFT.release-on-shutdown code 2 = unsigned integer 32;

class "win2k-clients" {
     match if option vendor-class-identifier = "MSFT 5.0";
     vendor-option-space MSFT;
     option MSFT.release-on-shutdown 1;

This makes XP & 2K clients release their IP addresses on shutdown.

David W. Hankins wrote:
> The technote quoted says it only happens on "non microsoft" DHCP servers.
> I wonder what MS's server is doing to get its clients out of this loop.
> This is all-hands week at ISC.  Because of that I'm fairly useless.
> IETF is next week.
> I won't have a chance to look in our lab for a few weeks at the earliest.
> Someone should be able to find out by getting a client into this state (it
> sounds like you need to give it a really long lease) and then attach it to
> a network where someone enabled "share network" on a regular Windows XP
> box.
> A pcap of that would save me a lot of effort.

           Jeff Wieland            |          Purdue University
    Network Systems Administrator  |         IT-I UNIX Platforms
        Voice: (765)496-8234       |       401 South Grant Street
         FAX: (765)496-1380        |    West Lafayette, IN 47907-1061

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