And don't forget NIS, and NSSwitch. And don't get me started on the
tricks that the windows resolver plays.
On 08/19/2018 07:59 PM, Mark Andrews wrote:
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
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