simple local caching DNS

[Gregory Hicks]

> From: "Clarence Brown" <clabrown at granitepost.com>
> To: "Charles Cala" <charles_cala at yahoo.com>, <bind-users at isc.org>
> Subject: Re: simple local caching DNS
> Date: Wed, 3 Nov 2004 13:02:56 -0500
> 
> Well, I guess I'm a little unsure of having a reverse zone without 
> a forward zone.... What are the ramifications of that? 

Well, here is MY reverse...

metis% cat db.127.0.0
@ IN  SOA metis.Cadence.COM. root.metis.Cadence.COM. ( 2002120212 1H 15M 1W 1H )
  IN  NS  metis.cadence.com.

1.0.0.127.IN-ADDR.ARPA.       	IN  PTR   localhost.

And the portion of named.conf that controls it...

------------ snip -----------
 zone "0.0.127.in-addr.arpa" in {
        type master;
        file "db.127.0.0";
        notify no;
};

------------ snip -----------

Ramifications?  Only that nslookup will not work without something like
the above...

We also have "localhost.cadence.com" defined in our main DNS tables...
So this name also resolves...

well% lookup localhost.cadence.com.
Server:  ns4.salon.com
Address:  206.14.209.126

Name:    localhost.cadence.com
Address:  127.0.0.1

Regards,
Gregory Hicks

> 
> Maybe a "fake" internal zone? 
> 
> How **__SHOULD__** this be handled?
> 
> Thanks, Cla.
> 
> ----- Original Message ----- 
> From: "Charles Cala" <charles_cala at yahoo.com>
> > 
> > --- Clarence Brown <clabrown at granitepost.com> wrote:
> >  
> > > c:\>nslookup
> > > *** Can't find server name for address 10.15.10.2: Non-existent domain
> > > Default Server:  ns1.sprintlink.net
> > > Address:  204.117.214.10
> > 
> > Lots of people are going to say that nslookup is broken, 
> > and windows is super broken ( I agree that windows is broken) 
> > however the issue with nslookup is that 
> > __ nslookup is functioning as written __ .
> > 
> > It is trying to do a forward/reverse lookup on the local name server 
> > and failing. You can "fix" this by adding a reverse zone for the private 
> > address space you have  your machines in. Be aware that sprintlnk  
> > won't have that  info.
> > 
> > -charles
> > 
> > 
> > 
> 
> 

-------------------------------------------------------------------
Gregory Hicks                        | Principal Systems Engineer
Cadence Design Systems               | Direct:   408.576.3609
555 River Oaks Pkwy M/S 6B1          | Fax:      408.894.3400
San Jose, CA 95134                   | Internet: ghicks at cadence.com

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