[Bug 264238] WiFi stops working after upgrade from 13.0 to 13.1, AR9285

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264238

Bjoern A. Zeeb <bz@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open

--- Comment #27 from Bjoern A. Zeeb <bz@FreeBSD.org> ---
In the 13.1 not-working case I see incoming TCP packets from the AP despite you
not having an IP address (assumed) given DHCP discover did not get a reply. 
There's also incoming ARP announcement from the AP-side;  that somehow means
the "network" knows where to find you (with your old IP address)?

Given I have no insight in how complex this network is (is it just a
residential router with builtin WiFi or more components) it is hard to say
where to start looking.

You should probably wait at least an ARP expiry timeout before running the 2nd
test.

The other interesting bit would be:

ifconfig wlan0 inet6 -ifdisabled accept_rtadv
ping6 -n ff02::1%wlan0
ping6 -n ff02::2%wlan0

and see if you get replies in the non-working IPv4 case given there seems to be
at least IPv6 link-local available on the RuiJieNe node.

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