[aprssig] APRS-IS: frames bypassing server filter

[John Langner WB2OSZ]

This has always been a mystery to me. 

The default behavior of an IS to RF IGate station is to transmit only:
- "messages" (special APRS meaning) addressed to someone recently heard
locally over the air, and
- a position report from the sender of the "message."

You can send filter specifications to the APRS-IS server to request
additional types of packets but there does not seem to be any way to reduce
the amount of stuff it sends to the IGate station.

This is a sample of what I get when not asking for anything special.  All of
this arrived in the few minutes it took to compose this message.


K2VUD-1>APWW11,TCPIP*,qAC,T2CAEAST:<IGATE,MSG_CNT=472,LOC_CNT=40,DIR_CNT=4,R
F_CNT=50,DX=83*W1MHL(26mi at 22-)
K2VUD-1>APWW11,TCPIP*,qAC,T2CAEAST:@235552h4202.56N/07126.78W#Yaesu
FTDX101MP
N2JNT-10>APWW11,TCPIP*,qAC,T2TRAC:>FN32er/# iGate Digi Brunswick, NY
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:>FULL SERVICE IGATE
W1TG-1>APU25N,TCPIP*,qAC,T2MAINE:>132357zDX: W1MRA 42.20.74N 71.34.04W 55.7
miles 223- 19:14
K1SRE-10>APWW11,TCPIP*,qAC,T2QUEBEC:T#761,100,048,002,128,000,10000000
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:@235836h4314.71NT07121.37W&THREE PINES RADIO
CLUB
K1SRE-10>APWW11,TCPIP*,qAC,T2QUEBEC:@235907hI8B=v<m-"&
sT!INSERVICE!PHG7350APRS-IS for Win32
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:>FULL SERVICE IGATE
K1SRE-10>APWW11,TCPIP*,qAC,T2QUEBEC:<IGATE,MSG_CNT=2,LOC_CNT=10,DIR_CNT=3,RF
_CNT=14,DX=10*KQ1L-1(69km at 319-)
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:>FULL SERVICE IGATE
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:T#262,100,048,002,128,000,10000000
N4SRN>APWW11,TCPIP*,qAC,T2SP:T#648,100,048,002,128,000,10000000
N1HRK>APU25N,TCPIP*,qAS,N1HRK-15:@140002z4133.95N/07129.60W_174/000g000t081r
000P000p000h69b10091wU2100 {UIV32N}
W1XM>APRX29,TCPIP*,qAS,W1XM:T#492,19.4,0.3,75.0,5.0,1.0,00000000
N2JNT-10>APWW11,TCPIP*,qAC,T2TRAC:<IGATE,MSG_CNT=59,LOC_CNT=12,DIR_CNT=3,RF_
CNT=30
K1RTA-1>APU25N,TCPIP*,qAC,T2MEXICO:@140003z4154.23N/06959.62W_000/000g000t07
6r000p000P000h85b10096 WX STATION AND DIGI {UIV32N}
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:>FULL SERVICE IGATE
W1XM>APRX29,TCPIP*,qAS,W1XM::W1XM     :UNIT.Rx Erlang,Tx
Erlang,count/10m,count/10m,count/10m
KC1LBM-2>APWW11,TCPIP*,qAC,T2HK:>FULL SERVICE IGATE
K1SRE-10>APWW11,TCPIP*,qAC,T2QUEBEC:>FN53bsI&DX: KQ1L-1 68.7km 319- 00:06
4414.82N 07025.15W<0x20>
N3LLO-3>APRX29,TCPIP*,qAC,T2GYOR:T#785,27.8,0.3,150.0,8.0,0.0,00000000


All of it gets thrown into the bitbucket because the default IS>RF
configuration discards it. 
It is a complete mystery why all this stuff is coming from the APRS-IS
servers when I did not ask for any of it.

Lynn's explanation doesn't make sense to me.   Perhaps one of the APRS-IS
server authors could provide some insight.