[Xastir] IGating

[Matt Werner]

Hi Alex -

I don't think so.  Once a server receives the packet it will not send
on the same packet if it hears it come in from a different igate or
server.  Imagine this:

One server (we'll call it "A") has 5 different igates connected to it
from one area and another server (we'll call it "B") has 5 more igates
connected.  This would represent a simplified (and probably
exaggerated) version of what we have now.

The way it works now, A hears a packet from K1ABC.  It's not seen this
packet before so it sends it to B.  Shortly afterwards, A hears the
packet from another igate.  It's a duplicate so it's discarded.
Shortly afterwards, B hears the same packet from one of the igates
connected to it.  It's also an duplicate so it's dropped.  And so on.
The totals: The packet is sent from A to B one time and from B to A
zero times.  In the event that A and B hear it at the same time it
could be sent from B to A once as well, but no more.

If we send *all* packets then the packet would be sent from A to B
five times and from B to A five times.  This is a 5-fold increase in
traffic in the A to B direction and at least that in the B to A
direction.

Now imagine this on a larger scale.  Thousands of stations.  30+?
Servers.  Hundreds of igates.

This is starting to get off-topic for the list - if you'd like to
continue the conversation please feel free to email me direct.

On 8/25/07, Alex Carver <kf4lvz at yahoo.com> wrote:
>
> --- Matt Werner <kb0kqa at gmail.com> wrote:
>
> > On 8/25/07, Alex Carver <kf4lvz at yahoo.com> wrote:
> >
> > > In that same train of thought, it would be nice if
> > the
> > > APRS-IS could show the duplicate packets instead
> > of
> > > discarding them.  Then you possibly _could_ get a
> > > better understanding of the RF network by watching
> > how
> > > a packet propagates and duplicates itself.
> >
> > Just imagine the additional load on the network if
> > that were the case.
> >  In some areas a packet could be heard by many many
> > different igate by
> > the time it takes it two or three hops.  That would
> > easily have the
> > potential of increasing the network traffic by 5x or
> > more I would
> > think.
>
>
> The load is already there.  The servers are comparing
> all the packets looking for duplicates and then
> discarding the duplicates.  So the load on the network
> shouldn't go up at all.  Rather you'd simply be making
> visible a portion of the traffic that is otherwise hidden.
>
>
>
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