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[aprssig] Periodic Disconnects from APRS-IS

Richard Montgomery kb4ytm at gmail.com
Fri Jan 19 15:18:26 UTC 2007


Can anyone get this queue information? I see a few stations near me that 
are constantly going "Igate Closed" and then transmitting 
"<IGATE,MSG_CNT=33,LOC_CNT=10" so I guess they are reconnecting 
immediately up disconnect. This occurs every 5 minutes or so on some 
stations. Would be good to send them a quick msg to let them know how to 
fix it.


AE5PL Lists wrote:
> Are you having an issue where you get disconnected from an APRS-IS
> server periodically (sometimes as often as every minute)?  Are you
> connecting to a full feed (port 23, 10151, 10152 on the core)?  Time to
> update your server list and start connecting to a filtered port (14580 -
> user defined, others may exist that are predefined, visit the web status
> page of the server you are connecting to for more information on
> available ports http://aprsserver:14501).
> I just did a scan of the core server status pages and found over 10
> clients with 5 to 15 seconds of packets backed up scheduled to go to the
> client.  This is caused by the client not being able to handle the
> packet flow from the server.  At 15 seconds of queued transmissions,
> your client will be disconnected to prevent loops.  Most of the time,
> this inability to handle the packet flow from the server is caused by
> the client software not being able to keep up.
> However, this could also be caused by a bottleneck enroute to or from
> your client (remember that your client is generating an ack for every
> packet if it has properly shut off the Nagel algorithm).  It may seem
> like you have plenty of bandwidth, but the full feed _averages_ 25-30
> packets per second which is significant for residential broadband and
> very significant for dial-up.  It is also very significant for most
> mapping clients to keep up with processing each station report.
> If you are accessing a full feed from an APRS-IS server and having
> problems staying connected, re-evaluate your need to connect to a full
> feed.  Most people have found that connecting to a filtered feed makes
> their PC and client much more responsive yet you still get full
> messaging capabilities even if your client is an IGate.  If you have a
> question about what kind of filters are available, check out
> http://www.aprs-is.net/javaprssrvr/javaprsfilter.htm
> This is an informational post and in no way is meant to impugn anyone's
> operation or configuration.
> 73,
> Pete Loveall AE5PL
> pete at ae5pl.net
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