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





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