reverse lookup returning "localhost"
Barry Margolin
barmar at alum.mit.edu
Fri Apr 13 01:52:50 UTC 2007
In article <evl8u9$lm7$1 at sf1.isc.org>,
Andrew Garnett <andrewwdg at yahoo.co.uk> wrote:
> All,
> I'm a bit baffled - we have an internal top-level DNS server for
> "company.com" (bind 9.2.1) which is reverse-resolving all IP addresses
> beginning with 207.x.x.x to "localhost".
> We have internal reverse lookup zones which work fine, and valid external
> reverse lookups seem to work fine. I don't have any references to 207 at all
> (and if we did, they wouldn't resolve every address to "localhost").
> Both nslookup and dig seem to suggest that it's getting this response
> locally, but I don't run a 207 zone. Sorry if I am missing something obvious.
> What can be returning "localhost" ?
My guess would be that there's a 207.in-addr.arpa zone configured on the
server, and it contains something like:
* IN PTR localhost.
What's strange, though, is that the server is returning a
non-authoritative response.
>
> Here's the dig info (run on the actual DNS server 10.56.11.55) :-
>
> dig @10.56.11.55 -x 207.1.2.3
> ; <<>> DiG 9.2.0 <<>> @10.56.11.55 -x 207.1.2.3
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19725
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
> ;; QUESTION SECTION:
> ;3.2.1.207.in-addr.arpa. IN PTR
> ;; ANSWER SECTION:
> 3.2.1.207.in-addr.arpa. 172800 IN PTR localhost.
> ;; AUTHORITY SECTION:
> 207.in-addr.arpa. 172800 IN NS localhost.
> ;; ADDITIONAL SECTION:
> localhost. 82574 IN A 127.0.0.1
> ;; Query time: 1161 msec
> ;; SERVER: 10.56.11.55#53(10.56.11.55)
> ;; WHEN: Thu Apr 12 12:55:05 2007
> ;; MSG SIZE rcvd: 93
>
> Thanks for any help,
> A
>
>
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--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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