[mrtg] Another Oddball Configuration Question

[Larry Sheldon]

I have what I thought was a simple thing to ask MRTG to do.

But after several trips through the documents I know to look in, I can't
find out how to do it--indeed I am no wondering if it is possible, 
although I would swear I have done something like this in the past.

The problem--to graph as "output" the sum of the "inputs" from several
interfaces on several "routers" (3com 3500's, actually) and as "input"
the "ouput" of a single interface on a real router.

(As I typed that, I'm not sure it made sense to me--the point is to relate
the traffic from several sources to its destination, the Internet.  I intend
to make a second graph showing the relationship of traffic from the Internet
to the outbound traffic to those same locations.  Still not sure if it makes
sense.)

The most recent target line reads:

Target[res.halls.internet-in.comp]: ifInOctets.8:public at creighton-main-2 + ifInOctets.11:public at creighton-main-1 + ifInOctets.12:public at creighton-main-1 + ifInOctets.13:public at creighton-main-1&ifOutOctets.1:public at creighton-internet

I get several whines from MRTG that indicates it is not parsing that the way
I thought it would--if the errors would be useful I can pass thme along too.

As usual, I will be grateful for help, including RTFM refences to specifics
as to the TM that I should FR.
--
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.                                                                       .
- L. F. (Larry) Sheldon, Jr.                                            -
. Unix Systems and Network Administration                               .
- Creighton University Computer Center-Old Gym                          -
. 2500 California Plaza                                                 .
- Omaha, Nebraska, U.S.A.  68178       Two identifying characteristics  -
. lsheldon at creighton.edu                  of System Administrators:     .
- 402 280-2254 (work)                Infallibility, and the ability to  -
. 402 681-4726 (cellular)               learn from their mistakes.      .
- 402 332-4622 (residence)                                              -
. http://www.creighton.edu/~lsheldon    Adapted from Stephen Pinker     .
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