[ale] WAS-Re: Comcast problems?now DNS

[Jim Popovitch]

On Fri, 2007-03-02 at 11:33 -0500, Christopher Fowler wrote:
> On Fri, 2007-03-02 at 10:35 -0500, Jim Popovitch wrote:
> > Try using these DNS servers instead of your own (much easier). 
> > 
> >         4.2.2.1
> >         4.2.2.2
> >         4.2.2.3
> >         4.2.2.4
> 
> But isn't the point of a caching name server to limit DNS requests over
> your Internet connection making things much faster.  

Yes, but it comes at a cost.  It should be thought of like NTP servers,
if you don't feed a sizeable client base, don't pull from a stratum 1
server.

> If the name server does not have a named cached it will request the name
>  and cache it. Each request from you will come from the cache and not 
> 4.2.2.1 above.

If you configure your caching DNS server to forward queries to your
upstream DNS server (as opposed to *ALL* of the root DNS servers) then
you are OK.  HOWEVER, most out-of-the-box distros provide a caching
nameserver config that needlessly forward every query (A/AAAA/PTR/) to
*ALL* of the Root DNS severs... including those for RFC1918 IPs.  This
needlessly overloads the root servers. 

-Jim P.
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