John are you using IPSec in the network? There was a discussion within the last month where there was a bug of sorts with using IPSec and 2008 DHCP the fix looked easy but if you are not using IPSec then it is not going to help much. I personally never saw an issue with a mix of XP and Vista clients but I had a flat IP space.
Jon On Wed, Feb 17, 2010 at 11:39 AM, Kurt Buff <[email protected]> wrote: > If you are sniffing on the client or at the switch, Wireshark. > > If you are sniffing on the server, either Wireshark or the Network > Monitoring Tools that come with the OS. > > However, if you can get one of these machines to get an IP address, > and then do an 'ipconfig /all' you'll see what it thinks is the DHCP > server. > > Kurt > > On Wed, Feb 17, 2010 at 06:46, John Hornbuckle > <[email protected]> wrote: > > Yesterday I started having some DHCP weirdness that has grown today. I’m > > kind of stumped and need some guidance. > > > > > > > > DHCP server is Windows Server 2008. It’s also a DC and DNS server. It > shows > > no errors relating to DHCP in Event Viewer, and there are plenty of > > addresses left in the scope. It can be pinged from client machines at >1 > ms > > and no timeouts, and it can ping client machines with the same results. > DNS > > is working fine. DC functions are working fine. > > > > > > > > DHCP, unfortunately, appears spotty. A number of clients (although > > apparently not all, from what I can tell) can’t get leases. If you run > > ipconfig /renew from a command prompt, they report that they can’t > contact > > the DHCP server. If you manually assign an IP address, all works fine. So > > network connectivity seems okay—this seems to be strictly a DHCP issue. > > > > > > > > I’m guessing that I’m going to need a packet sniffer to further > > troubleshoot. I have to confess, though, that I’ve never in my life used > > one. I’ve just never needed to. > > > > > > > > So, can anyone recommend a free, simple packet sniffer I can run from a > > client machine to watch the DHCP traffic? And what, exactly, should I be > > looking for? > > > > > > > > > > > > > > > > John Hornbuckle > > > > MIS Department > > > > Taylor County School District > > > > www.taylor.k12.fl.us > > > > > > > > > > > > > > > > > > > > NOTICE: Florida has a broad public records law. Most written > communications > > to or from this entity are public records that will be disclosed to the > > public and the media upon request. E-mail communications may be subject > to > > public disclosure. > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
