DNS issues, not sure how to fix

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http://forums.fedoraforum.org – I just replaced my Win8 machine with Centos 6.3, and everything seems to be fine (everything I have tested so far), except DNS on my local network. I have forced my NIC to use my router as the DNS server (which in turn uses my ISP info for DNS lookups). I can get to this website, Yahoo, etc... no problems, but anything on my local network, I have to access via IP address. I have another Linux machine (F17), and can access everything via name and IP address. Not using "hosts" file. Also, on my F17 machine, if I ping "pcname", I get a weird IP address in return, but (HowTos)