[aprssig] RADIO paths in APRS Servers

[Lynn W. Deffenbaugh (Mr)]

Andrew,

Digis and other APRS stations with "only a callsign" actually have an 
SSID of -0.  I don't believe this message thread is discussing any 
changes to how APRS stations identify themselves, but is clarifying that 
some stations do not properly update the collected path of used 
stations, so no concrete assumptions can be made based on an observed path.

However, by my understanding of APRS and AX.25, you can still specify an 
explicit path of stations if you desire to direct your packet manually.  
With the new non-zero SSIDs, you just have to put the appropriate 
-number on each digi to identify it.

Lynn (D) - KJ4ERJ - Testing my understanding of How Stuff Works

Andrew Rich (Home) wrote:
> When I started in Ham Radio we had digis that only had a callsign
>
> I could quite happilly direct a packet "via" a chain of digis I knew 
> to get to a friend.
>
> Then came the advent of Alias - or a generic call that digis could 
> adopt so you could drive around and hit any one of them.
>
> I just hope in the "noise" of progress, we don't do away with the 
> ability to be able to discern what digis , or more importantly, have 
> the ability to pick, which digis we go via.
>
>
> ----------------------------------------------------------
> Andrew Rich
> Amateur Radio Callsign VK4TEC
> email: vk4tec at tech-software.net
> web: www.tech-software.net
> ----- Original Message ----- From: "Steve Dimse" <steve at dimse.com>
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Sent: Friday, August 07, 2009 10:15 PM
> Subject: Re: [aprssig] RADIO paths in APRS Servers
>
>
>>
>> On Aug 7, 2009, at 12:02 AM, Pete Loveall AE5PL Lists wrote:
>>
>>> APRS servers and IGates do -not- strip the RF path on packets gated
>>> from RF to APRS-IS.
>>
>> But some of the other things he talks about are true. The path
>> statement of a packet cannot tell you the RF path, nor can it tell you
>> the Internet path. There are usually some pieces of information that
>> can be gleaned, but the complete path rarely appears, and you can
>> never rely on it. This is intentional. The focus of APRS is getting
>> the data where it belongs; the RF and Internet networks are designed
>> to accomplish the transport, not to provide a traceback.
>>
>> This is the reason findU, the APRS IS, and the RF network provide
>> limited information about propagation and network configuration. When
>> you hear someone making claims for producing network maps or analysis,
>> look closely at the assumptions being made, they are often not valid.
>>
>> Steve K4HG
>>
>>
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>
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