avoiding inverse mappings
Mark.Andrews at nominum.com
Mark.Andrews at nominum.com
Sat Apr 14 23:27:21 UTC 2001
> Hello,
>
> thank you for your answer.
>
> > Stop whatever application that is making those lookups from making
> > them. [...] ... sweep of your mail queue ...
>
> You got it exactly right! It always happened when sweeping the queue but I
> didn't notice it as there was an internet connection anyway, but each time
> *a local* mail was sent, sendmail did the inverse lookup:
>
> : Mar 21 15:45:35 router sendmail[460]: gethostbyaddr(192.168.99.1) failed
>
Since you are using this address space you should also be
serving the corresponding in-addr.arpa space. If you do
this then your servers won't need to talk to the internet
to resolve queries in this space.
Just create a minimal zone at first. SOA and NS record.
You can add the PTR records later if you want.
168.192.in-addr.arpa.db:
@ 3600 SOA ns1.example.com. hostmaster.example.com. (
1 3600 1200 2419200 7200 )
@ 3600 NS ns1.example.com.
> When dumping the traffic before, I wrongly thought the named would cause all
> the lookups since there were so many although no request came in. I
> completely forgot what tcpdump was doing...
>
> > You might be better to run a real name server and stop
> > forwarding queries to another server. Maybe your local
> > server could be configured as a slave for whatever
> > zone(s) are being looked up?
>
> That might be a good idea, I'll give that a thought.
> Thanks again for your help!
>
> Alex
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at nominum.com
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