Many APs include the ability display a list of associated nodes. Often this will include the ability to show the current signal strength of the node. Now the hard part is translating signal strength to distance. For instance the Linux Hostap drivers provide data about rx signal strength for each client in the /proc/net/hostap/wlan0 directory. Each client has an associated file in this directory named the same as the MAC address of the client. This file contains stats for the node. Example from my AP:
pebble:/proc/net/hostap/wlan0# grep "signal" *
00:02:8a:a3:25:83:last_rx: silence=160 signal=214 rate=110
00:04:23:53:19:36:last_rx: silence=160 signal=168 rate=10
00:0f:66:0f:a3:ce:last_rx: silence=161 signal=195 rate=110
00:30:65:09:ed:84:last_rx: silence=160 signal=185 rate=110
Cisco Aironet access points have the "show dot11 assoc" command which can show receive signal strength for each associated node.
- Dustin -
Rob Kelley wrote:
I'm wondering about showing users who connect to my wifi network the strength of their connection. Sure, I could just give them a link to NetStumbler and tell them to download the client, but I'm wondering.
Do wireless clients send out a signal that an access point can stumble
on and theoretically measure?
Is there a tool out there for accessing that information? The idea is a reverse signal-to-noise graph ("your client is this far from the node").
Thanks,
Rob
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