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DCMI - System i/ iSERIES/ AS400 Q & A Answers
A domain name server is used to help you communicate with other computers, without having to know their numeric IP address. IP based applications need to use numeric addresses for their source and destination. When I want to browse the iSeries 400 home page at www.ibm.com, I really need to specify something like 126.96.36.199 as the destination. The domain name server looks at the request for www.as400.ibm.com and returns the 188.8.131.52 to my computer, so it can access the iSeries 400 home page.
Currently, iSeries 400 does not run the domain name system protocol. Quite commonly, your ISP will provide this service for you. Use option 13 on the cfgtcp menu to enter this. Your PCs will also need to enter this address. If your ISP does not provide this service, they will likely require you to acquire another server (ie an RS/6000 or pc server) and use this as the domain name server.
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Updated October, 2013