Strange DHCP/DNS issues

Lately, evernow and again we'll recieve a call from a user who is having connectivity issues.  Upon further inspection, we find that they are simply unable to resolve hostnames both localy and externaly.  They can always ping IP addresses and recieve valid ip/dns/gateway addresses.  All it takes is a simple release/renew to fix the problem but it can be a handful to deal with when we have other problems/projects.  What could be causing this?  It almost always happens after a reboot but not always.
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logo29aAsked:
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chadConnect With a Mentor Commented:
when this occurs.. are these machines still listed in the DNS server? can they ping other machines by IP or addy?
IPCONFIG /all    shows what for DNS servers?

How is the DNS service setup?  for internal and external names?
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chadCommented:
Hi logo29a,
is this happening on multiple machines, a select few, or just one?
What OS is the clients that are having problems?
Is dynamic updates set up... scavenging?
what is the lenght of dhcp lease?

happy trails
Chad
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pseudocyberCommented:
How about obtaining a printout of ipconfig /all when someone has the problem?
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logo29aAuthor Commented:
The length of the lease is 8 days.  It is happening to a small few, seemingly random machines.  Machines having issues are both XP and 2000P machines.  Dynamic Updates are setup.  This all started rather recently.  
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pseudocyberCommented:
Could it be a virus?
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chadCommented:
how many DHCP leases are available?
How many clients are using those leases?
Any chance of running low on leases?
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logo29aAuthor Commented:
Couldn't be low on leases!  10.10.128.0-.255.254
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logo29aAuthor Commented:
We only have about 100 current leases.

The users that have problems already have valid leases and when we do a release/renew we end up with the same address; the only difference being that we can no resolve hostnames.
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logo29aAuthor Commented:
When I do an ipconfig /all, all of the DNS servers are listed correctly.  Usually, the machine can ping any machine on the network by ip address, but not by hostname.  There have been serveral instances when users are able to ping all of the hostnames on a network with the exception of our AS/400 machine.  

I haven't yet thought to check whether the client machine was listed properly in DNS, which is funny the fact that I was thinking that the clients might not be properly registering in DNS.  
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