Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!yetti!geac!daveb
From: daveb@geac.UUCP
Newsgroups: comp.mail.misc
Subject: Re: routing in the user agent
Message-ID: <1675@geac.UUCP>
Date: Fri, 23-Oct-87 14:16:05 EST
Article-I.D.: geac.1675
Posted: Fri Oct 23 14:16:05 1987
Date-Received: Sun, 25-Oct-87 10:46:22 EST
References: <279@minya.UUCP> <7461@g.ms.uky.edu> <287@minya.UUCP> <7651@steinmetz.steinmetz.UUCP>
Reply-To: daveb@geac.UUCP (Dave Collier-Brown)
Organization: The little blue rock next to that twinkly star.
Lines: 23
Keywords: bounced mail, rerouting
Summary: Oops! Add another rule.

||In article <7461@g.ms.uky.edu>, david@ms.uky.edu (David Herron -- Resident E-mail Hack) writes:
||Nonsense.  I have much better info than that.  My mailer extracts the
||paths from all incoming mail and puts it (with a timestamp) into the
||database.  I thus have good info on good paths to those people who
||have sent me mail lately.  This is at worst the same data as is used
||by the mailers; it is usually better.

In article <7651@steinmetz.steinmetz.UUCP> davidsen@crdos1.UUCP (bill davidsen) writes:
|Excuse me, but that's not always the case. Things like the net map are
|smart enough to understand that all paths are not bidirectional, or at
|least not equal in cost in both directions. Your reversal of the
|incoming path may produce an inefficient or inoperative path.

  Sounds like you need to have a path database and update routes
known to be bidirectional on the basis of usage.  Not an
unreasonable thing for a prolong (oops, prolog) program to do.
Add another rule!

-- 
 David Collier-Brown.                 {mnetor|yetti|utgpu}!geac!daveb
 Geac Computers International Inc.,   |  Computer Science loses its
 350 Steelcase Road,Markham, Ontario, |  memory (if not its mind)
 CANADA, L3R 1B3 (416) 475-0525 x3279 |  every 6 months.