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On my Windows 2003 Server domain controllers, most of them don't have IPs entered for the forwarder 'All other DNS names'. The only one that does, is one titled 'PDC'.

  • So for DNS queries to the ones that don't have a forwarder for external domains, where do the requests go? To that PDC server? or the root servers?
  • Can I trace this with dig?

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By default if no forwarder is listed it will use the root hints addresses.

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  • Is a forwarder with our ISP's dns better for any reason? Sep 8, 2009 at 14:31
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    Yes, DNS lookups through your ISP's servers are usually faster; if those servers becomes unavailable, root hints will be used (by default).
    – Massimo
    Sep 8, 2009 at 14:44
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    If your ISP does stupid thing with DNS (Verizon and their idiotic wildcard response for invalid domain names to redirect to their own "search engine" site) you may not want to use their DNS servers. Sep 8, 2009 at 15:11

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