reverse lookup on local IP (10.0.0.1)?

[Richard Barnes]

10.X.X.X is a non-routable IP address.

Unless you ran a local DNS deamon and have a 0.0.10.in-addr.arpa entry, you
should not be able to find any entires for a 10.x.x.x IP address.

I say "local DNS deamon" because there is absolutely no reason for an ISP to
do reverse DNS lookups on any non-routable IP addresses. (10.x.x.x,
172.x.x.x, and 192.168.x.x)

so to answer your question:

>Shouldn't I be able to resolve 10.0.0.1 to a name?

no...

your connection to the ISP is probably some form of NAT translation.
Meaning your caching server has two IP addresses on it (a real one, and the
non-routable one 10.0.0.1),  anytime one of you workstations requests an
Internet resource (webpage, newsgroup, etc.) your caching server does the
actualy request for you, and then sends the returned info to the client who
originally requested it.

Is there a reason you want reverse DNS setup?  If you are getting errors
when surfing, indicating that reverse DNS is not enabled, perhaps you should
contact you ISP and have them setup a reverse lookup entry for the IP
address of your caching server (the real, routable one).

-----Original Message-----
From: alex <alexkrowitz at my-deja.com>
Newsgroups: comp.os.linux.networking;,comp.protocols.dns.bind
To: comp-protocols-dns-bind at moderators.isc.org
<comp-protocols-dns-bind at moderators.isc.org>
Date: Friday, November 12, 1999 11:27 AM
Subject: reverse lookup on local IP (10.0.0.1)?


>Does anyone know whether I should be able to nslookup my local IP?
>
>I have a small network set up as 10.x.x.x, and dial in to an ISP.
>My caching nameserver is on 10.0.0.1.
>If I try (from the 10.0.0.1 machine) to nslookup 10.0.0.1, I get:
>
>-> Server:  localhost
>-> Address:  127.0.0.1
>
>-> *** localhost can't find 10.0.0.1: Non-existent host/domain
>
>Shouldn't I be able to resolve 10.0.0.1 to a name?
>
>Here's /etc/resolv.conf:
>order hosts,bind
>multi on
>
>Here's /etc/hosts:
>127.0.0.1       localhost               mydnshost.mydom.org
>10.0.0.1        mydnshost.mydom.org     mydnshost
>10.0.0.2        otherhost.mydom.org     otherhost
>
>
>Thanks for your help.
>--
>Alex <alexkrowitz at my-dejanews.com>
>
>
>Sent via Deja.com http://www.deja.com/
>Before you buy.
>
>