[CentOS] named server

On 5/18/05, Marc Powell <marc at ena.com> wrote:
> 
> 
> > -----Original Message-----
> > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> > Behalf Of Lee Parmeter
> > Sent: Tuesday, May 17, 2005 11:48 AM
> > To: centos at centos.org
> > Subject: [CentOS] named server
> >
> > I started the named server on CentOS and it seems to
> > resolve DNS request OK, but it does not seem to retain the
> > info for very long. From what I can tell using "dig", a
> > domain's ip address is retained for less than 12 hours. So
> > in the morning, it takes 4+ seconds to resolve again the
> > first time. Is there an adjustment somewhere for this or is
> > the caching named support not enabled by default?
> 
> Bind will use the Time To Live as configured by the owner of the domain
> name. There are other proxy DNS applications that allow you to override
> those values but I do not believe you can do so with bind.
> 
> > Also, I thought it would be faster if I set named to use my
> > ISP's named server as the first choice. Where do I set this
> > up, in root.hints?
> 
> http://64.233.187.104/search?q=cache:OFlpPzQRRcUJ:www.rhce2b.com/clublin
> ux/RHCE-19.shtml+bind+forwarders&hl=en
> 
> 19.3 Caching Only Name Servers
> 
>    1. Not authoritative for any zone.
> 
>    2. Uses DNS root servers or another name server known as a forwarder
> to resolve DNS queries.
> 
>    3. To create a Forwarding Name Server, put the following line in the
> "options" section of the /etc/named.conf file:
> 
> forwarders { 192.168.1.20; }; # replace with your upstream nameserver
> 
>    4. If you want BIND to only use it's forwarders to resolve hosts and
> not the root name servers, put the following line in the "options"
> section of the /etc/named.conf file:
> 
> forward only;
> 
>       The "forwarders" option specifies which DNS or DNS servers queries
> should be forwarded to for resolution.
> 

What is the difference between use forward only+forwarders and
directly set the nameserver inside resolv.conf ?

> > Anyone who knows more about "named" please feel free to
> > comment!
> 
> Google knows a lot. =)
> 
> --
> Marc
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