Re: Personal DNS

["Adam Alexander" <adam alexander lu>]

If you make your local machine a DNS server and make it your default DNS
server (by placing "nameserver 0.0.0.0" in your /etc/resolv.conf above any
other nameserver lines) then it will be automatically used when you are
connected to the internet via PPP.  This will almost always make your DNS
faster than using one on the other side of your PPP link.  The speed
increase will be most noticable after the first time you query the server
for a specific address record.  The reason for this is that the first time
you look up a site, you will query the local DNS and then the local DNS will
go over the internet and find out from the root servers what DNS server
holds the records for that domain, and then go to THAT server and ask for
the specific record.  The SECOND time you look up the record, your DNS will
already know the answer and provide it almost immediately.  This cached
entry will expire, however, at a configurable time after it was looked up
from the authoritative server.

Adam Alexander

-----Original Message-----
From: Ayman Haidar <haidar usol com>
To: redhat-list redhat com <redhat-list redhat com>
Date: Saturday, February 06, 1999 10:05 PM
Subject: Personal DNS


>Just a hypothetical question:
>
>can you run a DNS server on a PPP connection ?
>is it worth it.. I mean is there any speed difference if you use your
>DNS instead of the ISP one. ?
>
>I wanted to play with it, I'll get more motive if it was faster :-)
>
>Ayman
>
>
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