nslookup applies the search list by default and doesn’t stop on a NODATA response.
Some versions of nslookup have been modified by OS vendors to use /etc/hosts for address lookups. nslookup doesn’t display the entire response by default. > On 20 Aug 2018, at 12:28 pm, Lee <ler...@gmail.com> wrote: > > On 8/19/18, Doug Barton <do...@dougbarton.us> wrote: >> On 08/19/2018 12:11 PM, Lee wrote: >>> On 8/18/18, Doug Barton <do...@dougbarton.us> wrote: >> >>>> nslookup uses the local resolver stub. That's fine, if that's what you >>>> want/need to test. If you want to test specific servers, or what is >>>> visible from the Internet, etc. dig is the right tool, as the answers >>>> you get from nslookup cannot be guaranteed to be directly related to the >>>> question you asked. >>> >>> Could you expand on that a bit please? I thought >>> nslookup <name> <server> >>> was pretty much equivalent to >>> dig <name> @<server> >>> >>> the exception being that nslookup looks for a & aaaa records and dig >>> just looks for a records >> >> Nope. Depending on what operating system you're on, what version of >> nslookup you have, how you format your query, and how the system is >> configured; even telling nslookup to query a specific server may not get >> you the answer you're looking for. > > That's still awfully vague. Do you have any examples of > nslookup <name> <server> > returning bad information? > >> If you want to know what answer your stub resolver is going to return >> for a given query, nslookup is a great tool. Although, if you just need >> to know what address record you'll get back, ping works just as well. > > ping just shows one address; "nslookup www.yahoo.com" shows all of them > >> If you want to really debug DNS you need to learn to use dig, and >> understand the output. > > Agreed. If you're serious about debugging DNS you needs to learn dig. > But the assertion is >>>> ... the answers >>>> you get from nslookup cannot be guaranteed to be directly related to the >>>> question you asked. > > so I'm wondering how, or under what circumstances, nslookup returns > invalid information. > > Thanks > Lee > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
