[aprssig] Msg reply path (for SSn-N)

Robert Bruninga bruninga at usna.edu
Sat Oct 5 17:28:41 CDT 2013


Why would it fail?  If a message came in from VA3-3 to me and I live
in Maryalnd and my system ACKED via VA3-3 it should have a good chance
of  getting back to the Virginia originator.

If it came in via MD3--3 and my ack went out via MD3-3 it would still get back
to the Maryland Originator

But if it did as now, and ACKED via WIDE2-2, the default path in this
area, then NONE of these acks would get back and then we would have to
hear about 5 * 3 or 15 copies of the message and the same 15 copies of
my ACKS not getting back.  A travesty for the network.

So I disagree with your assessment.  Reversing an SSn-N path when N is
greater than 3 is almost required.  And it does not make a bit of
difference in overlapping areas as you suggest. (unless I am missing
something).

Bob, WB4apr

On Sat, Oct 5, 2013 at 11:44 AM, Stephen H. Smith <wa8lmf2 at aol.com> wrote:
> On 10/5/2013 9:09 AM, Robert Bruninga wrote:
>
>> BUT, in this specific case, of an SSn-N packet, maybe it is a good
>> idea to change the ACK from the standard (usually WIDEn-N) to a
>> returning SSn-N.  Reason being, it is the ONLY way the ack could get
>> back and if it was received, then apparently surrounding digis support
>> SSn-N.
>
>
>
>
> Acking by SSn-N is going to fail miserably in numerous metro areas that
> straddle two or more states. Some examples:
>
>    o   New York State/NYC/northern New Jersey
>
>    o   Philadelphia, PA/southern New Jersey
>
>    o   Chicago/NW Indiana/southern Wisconsin
>
>    o   Kansas City MO/Kansas City KS
>
>    o   Your own local environment with DelMarVa and DC
>        (FOUR separate SS-n systems within one or two hops!)
>
>    o   SoCal/Las Vegas/Phoenix
>
>    o   Central CA Valley (Stockton-Sacramento)/NW Nevada (Reno-Carson City)
>        (These areas are only ONE hop apart via digis in the High Sierras!)
>
>    o   Portland OR/Vancouver WA
>
>    o   Seattle WA/Vancouver BC
>
>    o   Southeastern MI - Detroit/Toledo OH/southwest Ontario - Windsor ON
>        See my live APRS webserver off-air-only map to see what passes as
>        "local" in lower Michigan at <http://WA8LMF.net/map>
>
>    o   Quad Cities on Mississippi
>        (Davenport IA - Bettendorf IA - Moline IL - Rock Island IL)
>
>    o   Omaha NE/Council Bluffs IA
>
>    o   New England (Boston MA/Rhode Island/southern New Hampshire)
>
> ___________________________________________________________
>
>
> --
>
> Stephen H. Smith    wa8lmf (at) aol.com
> Skype:        WA8LMF
> EchoLink:   14400  [Think bottom of the 2-meter band]
> Home Page:          http://wa8lmf.net
>
>
>  Long-Range APRS on 30 Meters HF
>     http://wa8lmf.net/aprs/HF_APRS_Notes.htm
>
> High Performance Sound Systems for Soundcard Apps
>    http://wa8lmf.net/ham/imic.htm
>    http://wa8lmf.net/ham/uca202.htm
>
> "APRS 101"  Explanation of APRS Path Selection & Digipeating
>   http://wa8lmf.net/DigiPaths
>
>
>
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