Hello together,
I have a problem. I want to sniff a network traffic (but without a
malicious inted, just to check how many packets were retransmited (retry
flag))
Okay, the problem now is that I have to change into the monitor-mode, to
get a DLT_IEEE802_11-frame packet.
With iwconfig wl0 mode monitor I envoked the monitor-mode on my Linksys
with a WRT-linux. And it seems to work, because I checked it again with
iwconfig. Important I use the 2.4 legacy-driver comming with OpenWRT!
In my program I have a if-brach:
if (pcap_datalink(handle) != DLT_IEEE802_11)
{
perror("is not an WLAN\n");
exit(EXIT_FAILURE);
}
but here it fails. Other if I used the same if-brach with
DLT_EN10MB, here it passes.
And I have another clue, that the device is not in monitor-mode. If I
check for MAC-addresses I just get some trash, however not valued
MAC-adresses.
Capturing wlan-packages is only possible while the device is in
monitor-mode. But I read here:
http://wiki.wireshark.org/CaptureSetup/WLAN that changing into
monitor-mode is not everywhere possible.
Are there anything I have to notice if I change into monitor-mode or if
I want to sniff for WLAN-packages?
Thank you very much
Gruss Christian
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