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Re: uri.host is down?

From: Stephen D. Williams <sdw@lig.net>
Date: Wed, 12 Apr 1995 14:11:45 +0000 (GMT)
Message-Id: <m0rz394-0009tGC@sdwsys>
To: rdaniel@lanl.gov
Cc: ren@dstc.edu.au, uri@bunyip.com
> On Apr 12,  3:35pm, Renato Iannella wrote:
> > If the URN denotes that uri.host.edu is the
> > name server, what can happen if the ns is down?
> > 
> > Since the "uri" part of the hostname is not 
> > specified in the URN, can we try uri2.host.edu ??
> DNS allows more than one IP address to be associated with a single
> FQDN. Typicaly proactice now is to do a gethostbyname(), look
> at the first IP address, and fail if you can't talk with it. We
> want client writers to be a little more tenacious in this. Keep
> the list of addresses, try one. If it fails try another. Keep
> doing that until you succeed or run out of IP addresses.

I agree!  I was surprised when I noticed a Unix telnet client that
did this.  It's a very good way to do load balancing.

An option to determine the best available IP at a given time would also
be nice.  It could measure round trip, hop count, and response time.

> Ron Daniel Jr.                     email: rdaniel@lanl.gov    
> Advanced Computing Lab             voice: (505) 665 0597
> MS B287                              fax: (505) 665 4939
> Los Alamos National Laboratory      http://www.acl.lanl.gov/~rdaniel/
> Los Alamos, NM  87545          tautology:"Conformity is very popular"

Stephen D. Williams 25Feb1965 VW,OH (FBI ID) sdw@lig.net http://www.lig.net/sdw
Senior Consultant, Manhattan Feb95- | 513-865-9599 FAX/LIG 513.496.5223 OH Page
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Pres.: Concinnous Consulting,Inc.;SDW Systems;Local Internet Gateway Co.;1Mar95
Received on Wednesday, 12 April 1995 15:16:26 UTC

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