[aprssig] are write-only APRS-IS clients valid?

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Dec 3 14:54:16 CST 2013

On 12/3/2013 3:00 PM, Lee Bengston wrote:
> I don't know if there is a documentation gap or not, but it seems that 
> what is not so well understood by "the community" is how the IS 
> servers recognize IGates and what is sent to them when no filter is 
> specified by the IGate.  I think it is a lot better understood now - 
> at least by the readers of this list.

I would caution against implying that IS Servers have any "knowledge" or 
"recognition" of an IGate.  What has been discussed here is the behavior 
of the APRS-IS servers on every filtered port regardless of what is 
connected to that port.  Saying that the IS server "knows" what an IGate 
is leads some people to believe that the APRS-IS does some sort of 
active routing to select IGates for message transmissions.  There is no 
such capability built into the APRS-IS.  Every filtered port that has 
recently delivered a packet for a given source will receive back packets 
of possible interest to an IGate for that/those stations for some period 
of time.  What the connected program does with those packets is not a 
concern of the APRS-IS network.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

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