Domain DNS without DHCP behind Linksys Router

I have setup a small office with only one server.  I have never setup a network this way before but it is a request by the owner.  We recently had problems with a previous server shutting down unexpectedly and corrupting the hard drives on the RAID.  The previous server was setup as a usual DNS/DHCP.  The problem with this was when the server was down there was no way for the workstations to receive the internet.  Now we want to supply the switch with the internet through a linksys router that will act as the firewall.  This way they will always have internet even if the new server is ever down and always be connected to eachother.  The problem I am having is with the setup of exchange.  It comes up with the error:

Setup cannot verify that the 'Host' (A) record for this computer exists within the DNS database on server XX.XX.X.XX.
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Mandeep KhalsaCommented:
You need to mix the DNS layout. Make the server a DNS server and in TCP/IP settings make it point to itself ( Then make Linksys a DHCP server and make it use the Exchange server as its primary DNS and an external DNS server (like OpenDNS) as its secondary and Tertiary listings.

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IT2100Author Commented:
Would I use the DNS provided by my ISP as the external DNS?

I saw that link in a search it was a bit confusing to me.
IT2100Author Commented:
Nevermind, I set it up and it works! Thank KhalsaComputer!
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