-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 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 -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE3p92iMrPBP64GmxZCu7JB1Xae1oFAmFz824ACgkQCu7JB1Xa e1ovXA//cqmtbQ8ZqGh2PKY/ec7B3uq1EDR8iVNQR8t1BC0LFBNDFlisoeVlIm5L ULlnpdCESNIX0tDNBebj9KsXjIz2cCrrpfTkQES82ndCo+j0LIsf95ql1NBB3QA2 ZkK4IjsNsWD3D9PLVvHgwFOD+EEwY1g9i8GzB/PlE2ckBiXu4PrkG3LJ0S/5PpsS i04xfdjddXpgTyZCbbpL+33o5S+/Yw4aOdUHfbvJZUxIoj5TNidoLGA41RndNJ9/ SkUXKNw8AA1vUUgdbbo4VL9eCWJgrEe4z1HG1xbQyWKZ67NQtvnh4lLTtAqkJgoo m+Y50Wc6jP6fPAuKz8PXe+NRF4BbLpsu1dXZNqplbOeBkgpiRdrJmPn8Y7HErtEe M4o7W54ov8lBT4vsHXD9AGjYY6ododcMKvcePq3/OHh3c9dA4mJUPHYommf4izY5 4pPVLBQXqn6H0UMALXIyFBpOkPCifP1Ghl9ZW9QAoRPF1mbpuavlRBChSD2S0QRq Em8sfQH5gTJi9ykni5B5uBs4LsP9yBuerRr3hOQhi2nNUgN+agpXyfh7Jfk8yY+D oYJQ2CfNo9JFolVr0fB18Jq2O27WRsnExPMUjluTcaw8UqkgXNrdYjRG/o0+VfN3 yWjV+vaol6Oap40tIUzxBQxkxgitLUrROQnYp9MBoZ3W1rr5KXg= =czaz -----END PGP SIGNATURE-----