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On Sat, 23 Oct 2021, Uwe Sauter via arch-general wrote:
Does the following quote, copied from
https://wiki.archlinux.org/title/Network_Debugging#Tcpdump, relevant?
they can only see outbound packets the firewall passes through:
[https://superuser.com/questions/925286/does-tcpdump-bypass-iptables]
Perhaps you should disable the firewall, or loosen it, while debugging.
Thanks for the hint, but it does not apply: (one of) the clients doesn't
even have a firewall enabled and I still cannot see the packages. To me,
it looks, like it doesn't even try to send the pings, because it maybe
thinks, the target is not reachable anyways ...
From my experience, tcpdump connects to the interface and you will see all
traffic regardless of firewall settings, given you have the permissions.
In your case I'd first verify that layer 2 is working correctly (layer 2 is
ethernet or wifi). So I'd use the utilities provided by "wpa_supplicant" or
"iw" to see if the "hardware connection" is working as expected.
If your wifi card didn't connect on layer 2 it has no reasons to configure
layer 3 (IP, IPv6) and above.
Well, layer 2 works, if it is needed for connections between the client
and the access point.
Layer 2 should already see mac addresses, right? Can you point me to a
command, which scans on layer 2 for all macs? I seem to only find how to
see the available access points (which works as expected) and using nmap
to ping around - which fails as expected :-/
Do you know any command to query the interface regarding routing
information (similar to what `ip route` does on layer 3 for the whole
machine)?
Regards,
Uwe
regards,
Erich
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