Aunc.1895
net.news
utcsrgv!utzoo!decvax!ucbvax!ihnss!mhtsa!harpo!chico!duke!unc!smb
Tue Feb 23 19:27:14 1982
maps of the world
Let me repeat my request for USENET map data.  My current input file is
based on Mark's USENET map; however, I know that there are many more
connections available.  If people will mail me the appropriate data for
their nodes, I will incorporate it into the map.  If possible, send it
in the format described below; also, do not include links that will not
forward mail from outside.  When the program is distributed (it will
be; until then, I'll be glad to produce maps of the world from anyone's
point of view, using my most current data -- and lack of good data is
one of the things holding up release), you'll be able to include your
own files which list non-public paths.

Enclosed is the definition of the Usenet nodes in North Carolina, as
well as the output the program produces.


First is a definition of the UNC local net.  To the pathalias program,
a local net is one with full implied addressing, and approximately
equal costs between any two nodes.  The '.' character is the network
routing character; that is, a user on 'grumpy' would say 'sleepy.fred'
to send a letter via the net.  If the '.' preceeded the '{', the
host-name would come last:  'fred.sleepy'.  The default, of course, is
'!'.  '(LOCAL)' is the cost of sending a message over this net.

The following lines set up aliases for 'unc', 'grumpy', 'sleepy', and
'happy'; normally, names like 'd' should not be used network-wide.

The Duke system is a more typical definition.  Each site is listed,
along with the sites it connects to; the cost is shown in parentheses.
A network routing character may either preceed or follow any node name
in the list.  Links are not bidirectional unless they are explicitly
coded as such.

       #
       # Define the UNC net
       #
       UNC     = {unc, grumpy, sleepy, happy}.(LOCAL)

       unc     = dopey, d, dvax
       grumpy  = g, gvax
       sleepy  = s, pdp
       happy   = h

       #
       # Now Duke
       #
       duke    phs(DIRECT-5), dukgeri(DIRECT-5), duke34(DIRECT-5)
       phs     duke(DIRECT)
       dukgeri duke(DIRECT)
       duke34  duke(DIRECT)

       #
       # and MCNET
       #
       mcnc    simon(DIRECT), unc(DIRECT), duke(DIRECT), web40(DIRECT+LOW),
               wolfvax, ncat(DIRECT)
       mcnc    = alvin
       simon   mcnc(DIRECT)
       unc     mcnc(DIRECT)
       duke    mcnc(DIRECT)
       wolfvax mcnc
       ncat    mcnc(DIRECT)

       #
       # UNC - Charlotte
       #
       web40   mcnc(DIRECT-5), twin40(DIRECT)
       twin40  web40(DIRECT)

       #
       # Triangle area
       #
       unc     duke(HOURLY), tucc(DIALED)
       duke    unc(DIRECT), tucc(DIRECT)
       tucc    unc(HOURLY-25), duke

------------

This map is from unc's point of view.  The output shows the cost, the
site name, and the path to reach the site; a '%s' indicates where the
userid belongs.  Network routing characters other than '!' except at an
end of the string are likely to cause trouble, because there's no
guarantee how the intermediate node will parse them.  That is, some
site along the way to say, Berkeley, might interpret a Berknet ':' in
its own way, rather than giving the '!' higher precedence.

       0       dopey %s
       0       unc %s
       0       d %s
       0       UNC %s
       0       dvax %s
       10      happy happy.%s
       10      sleepy sleepy.%s
       10      pdp sleepy.%s
       10      h happy.%s
       10      s sleepy.%s
       10      grumpy grumpy.%s
       10      gvax grumpy.%s
       10      g grumpy.%s
       200     mcnc mcnc!%s
       200     alvin mcnc!%s
       300     tucc tucc!%s
       400     ncat mcnc!ncat!%s
       400     duke mcnc!duke!%s
       400     simon mcnc!simon!%s
       405     web40 mcnc!web40!%s
       595     duke34 mcnc!duke!duke34!%s
       595     dukgeri mcnc!duke!dukgeri!%s
       595     phs mcnc!duke!phs!%s
       605     twin40 mcnc!web40!twin40!%s
       4200    wolfvax mcnc!wolfvax!%s

------------

Below are the numeric cost values.  The primary consideration is the
frequency and reliability of the connection; my assumption is that baud
rate is a minor variable compared to how long it will take to start the
mail transfer.  Costs may be combined using parentheses, '+', '-', '*',
and '/'.

       LOCAL      10   High-speed local net
       ARPA       31   ARPA net connection
       DEDICATED  95   BerkNet, or other line dedicated to file transfer
       DIRECT    200   Hard-wired connection used for 'cu' and 'uucp'
       DEMAND    300   Node called on demand, i.e., whenever there's traffic
       DIAL      300
       DIALED    300
       HOURLY    500   Connection made hourly (typically, via a poll)
  -->  DEFAULT  2000
       POLLED   5000   Polled daily
       DAILY    5000
       WEEKLY  30000   Polled weekly

       HIGH       -5   Baud rate or line quality modifiers (additive)
       LOW         5

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