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Date:	Fri, 14 Mar 2003 11:43:40 PST8
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: The debacle of email (hi Steven)

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In <3E71B76D.2B59@peterskye.com>, on 03/14/03
at 03:04 AM, Peter Skye said:

>I just ran NSLOOKUP a few times and got different responses. Yes, all of
>the Earthlink mail servers are listed -- but not in the same order. Yet
>they are in modulo numerical
>sequence so it's not just a case of randomly grabbing data
>from a database or a sort which doesn't maintain existing
>sequence.

I never needed to look at this all that closely. I just knew that the DNS
always returned all the answers in a single packet. The responses are
ordered by preference. Randomizing those with the same preference level
definitely makes sense. The modulo sequence makes sense too if all you
are interested in is distributing the workload.

>IPTRACE would be a good way to see if the DNS is actually
>supplying them in round-robin fashion.

Based on your nslookup output, I would be surprised it it did not. What
you can't tell is if there are intervening requests from other hosts.
That would explain the skips in the sequence.

Steven

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"Steven Levine" MR2/ICE 2.35 #10183 Warp4/FP15/14.085_W4
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