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Adding wireless router to my network with cable modem

Adding wireless router to my network with cable modem

Adding wireless router to my network with cable modem

(OP)
I am new to networking.  I have a small nework at home running off of a dell power edge 2450 server.  I have it configure as a DNS Server, DHCp, and IIS, I primarly use it for Database developement.  I recently picked up a wireless router, contected it to my cable modem and connected that to my switch.  IT appear that I conflict between my ISP DNS and my DNS server.  My network does not find the internet as long as it is looking at my DNS server address.  If I place my router address in place of my DNS server it finds the internet.  My ISP is Dynamic, How can I configure my DND server to repoint and pick up the ISP if and so my network can get to the internet ? Where in my server config  do I input My isp DND, Gateway, and wan address. ?

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