PC's on domain not registering to DNS

I have a SBS2008 and a sonicwall NSA240.  The SBS is our DNS server and the Sonicwall is our DHCP server.  All the PCs are joined to the domain and accessing data as needed.  I noticed that our remote location was unable to RDP any of the PCs by name and then discovered that none of the PCs (with exception of the server) are listed/registered in DNS.  They must have been registered at one time, but they no longer are.  How to I get the PCs to register to DNS.  What would cause them to vanish from the list?
PCNNYAsked:
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jakethecatukConnect With a Mentor Commented:
you need to configure your SBS2008 server to hand out the DHCP addresses and turn off the sonicwall DHCP server.

for DNS resolution to work effectively (along with your domain), SBS needs to handle all network type requests (DHCP, DNS etc).
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PCNNYAuthor Commented:
I would normally agree with that except that I have been using sonicwall dhcp for years and have never had this issue.
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PCNNYAuthor Commented:
We have switched it over to SBS and it works fine now.  Guess I'll stop using SW dhcp.
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