in reply to Module to return signal levels on captured packets

The signal level is a property of the wireless interface. It is not a property of any packets captured from that interface, and so cannot be derived from the packet content. tcpdump(1) is showing interface information that you could also display with iwconfig(1).

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Re^2: Module to return signal levels on captured packets
by porpoise_paul (Novice) on Jan 04, 2010 at 19:53 UTC
    I was obviously on the wrong track. Do you know of a way to measure signal level between two clients associated on the same AP?
[reply]
      Also, I've noted that TCPdump will report the signal value between myself and another client when sending echo requests to it. Actually, during the echo request I see the reply directly from the target and also from the AP that is acting as a hub in this instance. I did not think that iwconfig was able to provide signal levels between clients in this fashion. Is there a perl module that can read interface statistics such as TCPdump appears to be doing?

      Any direction is greatly appreciated.
[reply]
        If I understand your question correctly, then you want to try ifconfig and Net::Interface. For an example from the source:
        #!/usr/bin/perl

use strict;
use warnings;
use Net::Interface;

my @all = Net::Interface->interfaces(); 
print $all[0]->name,"\n"; 

my @allnames = "@all"; 
print @allnames,"\n";

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