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Article #216

Backlinks in MI Maps

#216
From: Michigan Coordinator - UUCP Mapp...
Date: Tue, 17 Nov 1992 02:41
44 lines
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[Taken from Bruce Lilly's recent posting]

Analysis of the latest UUCP maps available here as of today
revealed the following backlinks, i.e. missing (undeclared)
links for which the reverse link is declared in the maps.
[BTW, pathalias can be made to emit this information by
supplying more than one -v flag; e.g. pathalias -vv ...]

As the primary purpose of the UUCP maps is to describe the UUCP
network for the purpose of mail routing, and as a reverse link
is necessary (e.g for bounce messages), a missing link indicates
an inconsistency in the map data which may result in unusable or
unreliable paths.

One way the inconsistency can arise is if a link is removed from
one site's map entry (when the link is no longer functional),
but the other site's map entry is not revised. Certainly in this
case the link (either direction) cannot be counted on to work.

It is also possible that one direction of a link is not declared
by the corresponding site due to indolence, ineptness,
ignorance, selfishness, etc. In this case as well, the link can
probably not be relied upon.

Finally, it is possible that the forward link is a typographical
error, e.g. a link may be declared where an alias is intended
(i.e. the '=' is left out).

abdul <- clif
ackpfft <- wsu-cs
ackphfft <- modcomp
f117a <- m-net
genias <- wybbs
mastro <- sycom
meros <- clmqt
miccal <- fernwood
micro <- wsu-cs
myamiga <- mixcom
nthstone <- irie
orage <- ombrage
psgi <- vela
therip <- wybbs
unisysmi <- sharkey
ylum <- lokkur
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Message-ID: <1992Nov17.024136.19118@rel.mi.org>
Path: arc1-ca.pugleaf.net!sparky!uunet!hela.iti.org!nigel.msen.com!rphroy!caen!destroyer!rel!uucpmap

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Path: arc1-ca.pugleaf.net!sparky!uunet!hela.iti.org!nigel.msen.com!rphroy!caen!destroyer!rel!uucpmap
From: uucpmap@rel.mi.org (Michigan Coordinator - UUCP Mapping Project)
Newsgroups: mi.misc
Subject: Backlinks in MI Maps
Message-ID: <1992Nov17.024136.19118@rel.mi.org>
Date: 17 Nov 92 02:41:36 GMT
Organization: Michigan Mail Police
Lines: 44