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

Lee Bengston lee.bengston at gmail.com
Tue Dec 3 13:39:07 CST 2013


On Tue, Dec 3, 2013 at 6:01 AM, Heikki Hannikainen <hessu at hes.iki.fi> wrote:

> On Tue, Dec 3, 2013 at 3:17 AM, Lee Bengston <lee.bengston at gmail.com>
> wrote:
> >
> > Yes, the heard list should give the IGate the necessary packets, but what
> > about the ability of the IGate to determine if a station heard on RF is
> also
> > directly connected to the Internet/APRS-IS?  With no range filter (or a
> very
> > small range filter), wouldn't that create the possibility of gating a
> > message via RF addressed to a station heard on RF that is also connected
> to
> > the Internet?  Or would the IS server take care of this by not sending
> the
> > message to IGates that have gated RF beacons from the message recipient -
> > instead only send the message to the addressee?
>
> To support that, the server gives the igate all Internet-originated
> (TCPIP*) packets of stations which have been heard by that igate
> (within the "heard" table expiration time).
>
> i.e. if OH7LZB-5 appears on RF behind igate OH2RCH, and then there are
> OH7LZB-5>APRS,TCPIP*,... packets on the APRS-IS, the servers will give
> those packets to OH2RCH for the next 1 or 3 hours so that the igate
> knows the station is also on the Internet.
>

Thanks, and I remember now that a couple of years ago I observed exactly
that.  I guess I slept too many times since then.  That was not stated in
the previous messages in this thread, however, so I am glad it is clarified
here.

Regards,
Lee - K5DAT
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