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[aprssig] HELP! Digipeat storm in SE PA

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Mar 20 21:18:08 UTC 2012


APRSISCE/32 detects that an outbound APRS message is destined for itself 
and loops the answer around as an Internal packet.  No sense clogging 
either the RF or the -IS with software that's just talking to itself.

The strange thing I see is that none of the packets that were logged 
from RF by N3TUQ-5 were 3rd party packets.  It is possible that no local 
IGate was considering your station recently local to gate out to you?  
What do your own RF reception logs show as the sequence of events back 
at the start of the conflagration?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Wi32

On 3/20/2012 5:12 PM, Andrew P. wrote:
> True, but the YAAC instance at that time wasn't I-gating (digipeating WIDE1-1, yes, but not I-gating). Notice that two other local I-gates were repeating the message back to me over RF after forwarding it via APRS-IS.
>
> YAAC was sending responses every 30 seconds because it was receiving a digipeated copy of the original query every 30 seconds (until I took it off the air). I confirmed that from the debug logs. So, I'm trying to track down who kept that query message packet repeating so much. I don't have a record of an ack packet going out or coming in, so that may be part of it..
>
> No one responded on part of my original question: is it OK to query your own station via a digipeater bounce? Anybody know the answer to that one?
>
> Andrew Pavlin, KA2DDO
>
> ------Original Message------
> From: Tom Hayward
> To: aprssig at tapr.org
> To: yaac-alpha-testers at yahoogroups.com
> Sent: Mar 20, 2012 4:53 PM
> Subject: Re: [aprssig] HELP! Digipeat storm in SE PA
>
>
> On Tue, Mar 20, 2012 at 13:05, Lynn W. Deffenbaugh (Mr)
> <ldeffenb at homeside.to>  wrote:
>> Opentracker digipeat bust with WIDE1-1 becoming an unused WIDE1 which the
>> Tracker2 family digipeats anyway?
> What makes you think it was digipeating an already used path? I don't
> see any packets (in your log) that appear to be N3TJJ-8 acting on an
> unused path.
>
> http://ldeffenb.dnsalias.net/20120320-KA2DDO.txt
> 2012-03-20 13:05:07 KA2DDO>APJYC1,N3TJJ-8*,WIDE1*,qAR,N3TUQ-5::KA2DDO
>   :?APRSL{m0001
> <snip>
> 2012-03-20 13:07:31
> KA2DDO>APJYC1,WIDE2,WI3Z-1,WIDE1,N3TJJ-8,qAR,N3TUQ-5::KA2DDO
> :LOCAL(1): AA3GN-1 AA3JC-3 AB3LT-1 K2GE-15 K3BZG-3 K3XY-3 K3ZMC-1
> 2012-03-20 13:07:31
> KA2DDO>APJYC1,WIDE2,WI3Z-1,WIDE1,N3TJJ-8,qAR,N3TUQ-5::KA2DDO
> :LOCAL(2): KA1UDX KA1UDX-1 KA2DDO KB3RNL-3 KB3SVY-2 KC2TXX-15
> 2012-03-20 13:07:32
> KA2DDO>APJYC1,WIDE2,WI3Z-1,WIDE1,N3TJJ-8,qAR,N3TUQ-5::KA2DDO
> :LOCAL(3): KF3M-1 N2IGU-1 N3FCX N3FYI-1 N3KTX-2 N3KTX-9 N3MYB-13
>
> It looks to me like KA2DDO's YAAC i-gate is replying to the query with
> a path generated by reversing the path of the received query packet
> (the log above doesn't contain the actual query packet with the path
> that was reversed, but the first one is similar). From the log, it
> appears YAAC is responding to the same query multiple times (this log
> contains all dupes, right?). I wouldn't be surprised if this is a
> problem with YAAC--it claims "alpha" status.
>
> N3TJJ-8*,WIDE1* is converted to WIDE1,N3TJJ-8 by YAAC.
>
> I'm curious what caused it to send query responses every 30 seconds
> (sometimes longer) for the 40 minutes of logged data.
>
>
> Tom KD7LXL
>
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