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Article #220

Re: dial-up networking: should i add dns ?

#220
From: Chris Shenefiel
Date: Tue, 12 May 1998 00:00
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HOWEVER!!

If you add a caching DNS server to your on-demand dialer, you may not get reliable dial startups if
you are receiving dynamically assigned IP addresses from your ISP provider.  This is particularly
true of diald.  Diald works now, for you, because each initial connection to the internet is through
a UDP DNS request.  UDP request survive network interface changes that occur between the dummy sl0
connection of diald and the real ppp0 connection that comes to life after you connect.  However, if
you install a caching named, you will no longer send the UDP requests across the network and will
resolve host names locally.  Therefore, you will then use interface-oriented packages that won't
survive a network interface transition from the dummy interface to the real one.

So, if you are receiving dynamically assigned IP addresses and you are using diald, I would
recommend not setting up a caching name server.

FWIW,
Chris

George Bonser wrote:

> A cacheing-only nameserver can be a great help if you frequently revisit the
> same sites. It can also speed up mail collection too since you will not have
> to do a name lookup for each transaction.  If you are using your Linux
> box as your outbound mail server, adding a nameserver is a great help.
>
> --
> George Bonser
>
> Microsoft! Which end of the stick do you want today?
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From: Chris Shenefiel <cshenefiel@att.com>
Subject: Re: dial-up networking: should i add dns ?
Date: 1998/05/12
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