[aprssig] APRS-IS Database :: Query for static dataset

Paul Bramscher pfbram at comcast.net
Tue Jul 21 18:14:31 CDT 2015


I had similar questions a few months ago, this has been a good thread.
Is it the t2 servers that do the de-deping?  If I submit a packet to
"rotate" that ends up going to "first" and my neighbor does the same,
but a second or two later, I understand that it will be deduped.

But if the guy a mile or to away ends up submitting the same packet to
"second", how is the deduping behavior there going to be aware of what
happened on "first"?  Is there a final round of de-duping on the core
APRS servers?

73, KD0KZE / Paul

On 7/19/2015 1:08 PM, Kenneth Finnegan via aprssig wrote:
> Each APRS-IS maintains an internal table of packets it has seen in the
> last 30 seconds for dedup. After 30 seconds, the IS server throws them away.
> 
> --
> Kenneth Finnegan
> http://blog.thelifeofkenneth.com/
> 
> On Sun, Jul 19, 2015 at 10:58 AM, Nagi Punyamurthula <n0agi at n0agi.com
> <mailto:n0agi at n0agi.com>> wrote:
> 
>     Thanks – that’s what I thought.  ____
> 
>     What made me think of asking this question was given that the
>     APRS-IS server checks for packet dups submissions, I was thinking,
>     there had to be previous records stored somewhere to compare w/. ____
> 
>     __ __
> 
>     So, that begs a question; how does the APRS-IS determine whether a
>     record is dup vs not ? and what  does it compare the new incoming
>     packet to.____
> 
>     __ __
> 
>     __ __
> 
>     __ __
> 
>     *From:*Kenneth Finnegan [mailto:kennethfinnegan2007 at gmail.com
>     <mailto:kennethfinnegan2007 at gmail.com>]
>     *Sent:* Sunday, July 19, 2015 11:02 AM
>     *To:* TAPR APRS Mailing List <aprssig at tapr.org
>     <mailto:aprssig at tapr.org>>; Nagi Punyamurthula <n0agi at n0agi.com
>     <mailto:n0agi at n0agi.com>>
>     *Cc:* mnaprs at googlegroups.com <mailto:mnaprs at googlegroups.com>
>     *Subject:* Re: [aprssig] APRS-IS Database :: Query for static
>     dataset____
> 
>     __ __
> 
>     There is no such thing as the APRS IS database pool. It is just a
>     firehose of packets and if you want to see past data you need to
>     have saved it when it came through. ____
> 
>     Kenneth Finnegan____
> 
>     On Jul 19, 2015 8:48 AM, "Nagi Punyamurthula via aprssig"
>     <aprssig at tapr.org <mailto:aprssig at tapr.org>> wrote:____
> 
>         Hello all____
> 
>         Is there a way to pull a static snapshot dataset from APRS-IS
>         Database.  That is, connect à get dataset (based on a few
>         filters) à disconnect. The purpose of this is to get a
>         historical snapshot of data from the APRS-IS Database pool.  Is
>         this query exposed today in APRS-IS infrastructure; or does one
>         need to implement our own repository logic? ____
> 
>          ____
> 
>         I have been able to pull realtime JIT data via establishing a
>         TCP connection to the server pool on port 14580. So, I know we
>         can do that.  But, I was not sure if it is possible to pull
>         static historical dataset and **whether if that static view was
>         even kept in the APRS-IS database pool**.____
> 
>          ____
> 
>         Any pointers here from the APRS-IS gurus ____
> 
>          ____
> 
>         Thanks____
> 
>         Nagi____
> 
>          ____
> 
>          ____
> 
>         73, N0AGI-Nagi____
> 
>         cid:image001.jpg at 01D08197.994BC970____
> 
>         http://N0AGI.com/____
> 
>          ____
> 
>          ____
> 
>          ____
> 
> 
>         _______________________________________________
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>         aprssig at tapr.org <mailto:aprssig at tapr.org>
>         http://www.tapr.org/mailman/listinfo/aprssig____
> 
> 
> 
> 
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