Re: DHCP over WiFi issues on RPI

[David Young <dyoung%pobox.com@localhost>]

On Fri, Apr 06, 2018 at 08:19:14PM -0000, Michael van Elst wrote:
> ef%math.uni-bonn.de@localhost (Edgar =?iso-8859-1?B?RnXf?=) writes:
> 
> >In the DHCPDISCOVER, what are the values of giaddr, ciaddr and the BROADCAST 
> >flag?
> 
> >Is there any packet filter or the like on the Pi?
> 
> 
> tcpdump would see packets before they are filtered. Of course the
> driver and the net80211 stack might discard packets.

It's been a while, but ISTR that to see the packets before the net80211
stack has processed them, I ran:

	tcpdump -nel -y ieee802_11_radio -i <interface>

and to see the packets after net80211 owned them---but possibly before
it has decided whether to discard/keep?---I ran:

	tcpdump -nel -y ieee802_11 -i <interface>

Dave

-- 
David Young
dyoung%pobox.com@localhost    Urbana, IL    (217) 721-9981