Date: Sun, 15 Dec 2002 21:30:18 -0600 (CST) From: Jamie <jamie@gnulife.org> To: freebsd-questions@FreeBSD.ORG Subject: Re: named.conf - what is "forwarders" Message-ID: <20021215212815.G27446-100000@floyd.gnulife.org> In-Reply-To: <20021215022659.GA6592@gothmog.gr>
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On Sun, 15 Dec 2002, Giorgos Keramidas wrote:
> On 2002-12-14 18:10, Bsd Neophyte <bsdneophyte@yahoo.com> wrote:
> >
> > this is what the comment says...
> >
> > // If you've got a DNS server around at your upstream provider, enter
> > // its IP address here, and enable the line below. This will make you
> > // benefit from its cache, thus reduce overall DNS traffic in the
> > Internet.
> > /*
> > forwarders {
> > 127.0.0.1;
> > };
> > */
> >
> > but i don't understand what this means? what do i use to replace the
> > 127.0.0.1? do i replace it with both my ISP's domain name server ip
> > addresses?
>
> That's one possibility.
>
> > what are forwarders?
>
> DNS servers that your local named will query for all domains it
> doesn't know about. Queries for the local domains are served from the
> local zone files. All other queries go through a different procedure
> which usually requires sending queries to the root name servers and
> several others. This information is cached by the querying named
> instance for a while.
>
> Instead of having your named make queries to root name servers, .com
> nameservers, and then google.com. nameservers, when you use forwarders
> the servers that you have configured as forwarders are queried.
> Bearing in mind that your ISP has many users who probably ask for the
> similar DNS information all the time, it is very likely that their
> name server has this information already. This is why named.conf
> suggests that you use *them* as forwarders.
>
> - Giorgos
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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>
If you want more information on how this works, I would recommend
getting a copy of "DNS and Bind" by Paul Albitz and Cricket Liu. They
cover the theory you are looking at in chapters 2 and 10.
- Jamie
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