[aprssig] I-gates filtering on PID

Robert Bruninga bruninga at usna.edu
Tue Oct 3 13:27:16 EDT 2017

Once I tuned to FALCONSAT with my D710G interal modem, and using PuTTY, I
did learn that at least that TNC only passes along UI packets and APRS
packets.  This is NOT the flood I thought I would see.  It is only a packet
every few seconds.  No problem for Igating to the APRS-IS.

Of course, the RF channel is still a 100% stream of AX.25 data carrying the
BBS file data, it does not seem to be picked up by the TNC presumably due
to the difference in their PID’s.

I just do not know if all TNC’s inherently only pass the F0 PID or just
some of them.

But there is a packet every minute or so that is gyberish and locks up
PuTTY.  At least a few times per pass.  That might be a problem for most


*From:* Kenneth Finnegan [mailto:kennethfinnegan2007 at gmail.com]
*Sent:* Tuesday, October 03, 2017 12:40 PM
*To:* Robert Bruninga
*Cc:* TAPR APRS Mailing List
*Subject:* I-gates filtering on PID

On Tue, Oct 3, 2017 at 6:41 AM, Robert Bruninga <bruninga at usna.edu> wrote:

Since the BBS packets use a different PID I don't think you can see them
through a normal IGate

I was actually just discussing this with Hessu a few weeks ago as to
whether this was a valid assumption or not. I know that at least in Aprx we
don't perform any filtering based on PID. Should we be?

There has not been a clear mandate for I-gate software to filter on the
PID, so I wouldn't be surprised if that feature is rare.

and it would flood the APRS-IS..

So what? Any APRS-IS servers which have difficulty handling an additional
9600bps on their -IS stream have no business being an APRS-IS server. Worst
case this thins the herd and we no longer have such an overkill of APRS-IS

Kenneth Finnegan, W6KWF
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