SUMMARY: Success! Reverse lookups now work!

From: Rae, Scott (Scott.Rae@Calanais.com)
Date: Fri Jul 14 2000 - 08:35:28 CDT


I received a couple more responses - thanks to Craig Russell and Richard
Bond.

Although I'd already looked at it many times, today I took another look at
named.boot, and found that the in-addr.arpa. entry was wrong. Whoever put
this line in, put the octets of the subnet in the correct order, not in
reverse.

        The subnet is 10.100.7.

        The original record said:

                10.100.7.in-addr.arpa.

        so I changed it to:

                7.100.10.in-addr.arpa.

        and now reverse lookups for that subnet work!

No doubt now that I resolved that one I'll be given lots of DNS problems to
look at.

What a great list this is.

Scott
--------------------------------------------------------------------------Su
mmary of other responses:

> I got several very useful replies to my question, which is copied at
> the bottom of this message. Unfortunately I was not able to resolve the
> problem. After spending a few hours on it, the user said that things were
> working well enough for now (they don't NEED to do reverse lookups at
> present), and my boss said I had to go and do other things anyway....
>
> Many thanks to Robert Hayne, Todd Herr, Philip Ordinario, Claudio
> Cuestas, Adam and Christine Levin, Dave McFerren, Rodney Wines, Richard
> Butler, Hoang Nguyen and Peter Gutmann for their help.
>
> The main suggestions were:
>
> 1. You've got to update the serial number, by incrementing it, each
> time you update a named file, and then signal your named process
> to re-read your named file by HUP'ing the named process:
>
> kill -HUP <named process PID>
>
> A good format to use for your serial numbers is:
>
> YYYYMMDDXX
>
> where YYYY is the year the file was changed
> MM is the month
> DD is the date
> XX is a two digit number (you probably won't make 100 changes
> per day)
>
> So, the first time you modify a file today, your serial number
> in that file should be set to:
>
> 2000071101
>
> if you mod it again today, set it to 2000071102, and so on.
>
> 2. Run nslookup query without any hostname nor ip address to see if the
> correct DNS server responds.
>
> 3. Check that a PTR record exists in the named.rev file or equivalent.
>
> No doubt this one will come back to haunt me!

--------------------------------------------------------------------------

Original Post:

> > Hello,
> >
> > I'm having problems doing reverse lookups of two
> hosts that have
> > recently been added to DNS database files. There
> are PTR records for the
> > hosts in the named.rev file, and we can do reverse
> lookups for other
> hosts.
> > The PTR records for the new hosts look good to me,
> though I must confess I
> > have not done a lot of DNS things.
> >
> > I have followed the DNS troubleshooting guide in
> "NEtworking Unix"
> > by Salim Douba, but I am still having problems.
> When I try the lookup I
> get
> > the "Non-existent host/domain" error, but of
> course the host and domain do
> > exist.
> >
> > Does anyone have any ideas? I've run out of
> things to look at. One
> > thing I don't fully understand is the serial
> numbers of the database
> files.
> >
> > Any help would be much appreciated.

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