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Old 03-02-2005   #1 (permalink)
davenport
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Question Explain Periodic Zero Signal Entries in Wi-Scan
All,

I am under the assumption that Netstumbler transmits probe request frames at a periodic rate looking for any and all APs (not specific, individual APs) and records all probe response frames it receives from APs that are configured to broadcast their SSID (i.e. "open" APs).

In my wi-scan output I find many entries with valid GPS, SSID, MAC data but with a zero triplet of [ SNR Sig Noise ] = [ 0 0 0 ]. Can anyone help me explain the zero triplet?

Did Netstumbler receive a valid probe response frame but get bad/no SNR Sig Noise values from the NIC/driver (I'm using Orinoco silver)?

Did Netstumbler send a specific probe request to the specific AP and fail to get a response?

# $Creator: Network Stumbler Version 0.3.30
# $Format: wi-scan
# Latitude Longitude ( SSID ) Type ( BSSID ) Time (GMT) [ SNR Sig Noise ]
# $DateGMT: 2005-01-19
N 0.0000000 E 0.0000000 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:46:56 (GMT) [ 23 84 61 ]
N 0.0000000 E 0.0000000 ( Node1Radio4 ) BBS ( 00:0f:3d:ab:1a:fb ) 16:46:56 (GMT) [ 28 88 60 ]
N 41.4608650 W 87.4572350 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:46:57 (GMT) [ 29 84 55 ]

[snip]

N 41.4608660 W 87.4572330 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:09 (GMT) [ 0 0 0 ]
N 41.4608660 W 87.4572330 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:09 (GMT) [ 25 79 54 ]
N 41.4608660 W 87.4572330 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:09 (GMT) [ 23 83 60 ]
N 41.4608660 W 87.4572330 ( Node1Radio4 ) BBS ( 00:0f:3d:ab:1a:fb ) 16:47:09 (GMT) [ 33 88 55 ]
N 41.4608660 W 87.4572330 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:09 (GMT) [ 23 83 60 ]
N 41.4608660 W 87.4572330 ( Node1Radio4 ) BBS ( 00:0f:3d:ab:1a:fb ) 16:47:10 (GMT) [ 28 89 61 ]
N 41.4608660 W 87.4572330 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:10 (GMT) [ 30 87 57 ]
N 41.4608660 W 87.4572330 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:10 (GMT) [ 29 86 57 ]
N 41.4608660 W 87.4572330 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:10 (GMT) [ 29 86 57 ]
N 41.4608660 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:10 (GMT) [ 0 0 0 ]
N 41.4608660 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:11 (GMT) [ 28 85 57 ]
N 41.4608660 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:11 (GMT) [ 28 85 57 ]
N 41.4608660 W 87.4572320 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:11 (GMT) [ 33 87 54 ]
N 41.4608660 W 87.4572320 ( Node1Radio4 ) BBS ( 00:0f:3d:ab:1a:fb ) 16:47:11 (GMT) [ 26 87 61 ]
N 41.4608660 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:11 (GMT) [ 27 84 57 ]
N 41.4608670 W 87.4572320 ( Node1Radio4 ) BBS ( 00:0f:3d:ab:1a:fb ) 16:47:12 (GMT) [ 23 83 60 ]
N 41.4608670 W 87.4572320 ( Node1Radio2 ) BBS ( 00:0f:3d:ab:1a:fc ) 16:47:12 (GMT) [ 28 83 55 ]
N 41.4608670 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:12 (GMT) [ 0 0 0 ]
N 41.4608670 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:12 (GMT) [ 29 85 56 ]
N 41.4608670 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:12 (GMT) [ 29 85 56 ]
N 41.4608670 W 87.4572320 ( Node1Radio1 ) BBS ( 00:0f:3d:ab:1a:d9 ) 16:47:12 (GMT) [ 28 84 56 ]
Thanks!
Dave
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Old 03-02-2005   #2 (permalink)
wrzwaldo
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Quote:
Originally Posted by davenport
All,

I am under the assumption that Netstumbler transmits probe request frames at a periodic rate looking for any and all APs (not specific, individual APs) and records all probe response frames it receives from APs that are configured to broadcast their SSID (i.e. "open" APs).

In my wi-scan output I find many entries with valid GPS, SSID, MAC data but with a zero triplet of [ SNR Sig Noise ] = [ 0 0 0 ]. Can anyone help me explain the zero triplet?

Did Netstumbler receive a valid probe response frame but get bad/no SNR Sig Noise values from the NIC/driver (I'm using Orinoco silver)?

Did Netstumbler send a specific probe request to the specific AP and fail to get a response?

...
Wrong train of thought! I would not consider them "open".
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Old 03-02-2005   #3 (permalink)
Thorn
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Quote:
Originally Posted by davenport
...

Did Netstumbler receive a valid probe response frame but get bad/no SNR Sig Noise values from the NIC/driver (I'm using Orinoco silver)?

Did Netstumbler send a specific probe request to the specific AP and fail to get a response?
...
This is one of this little internal things that only Marius knows for certain. It's probably the former rather than the latter. It may also be the periodic disconnect that NS performs.
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