After upgrading via sysupgrade for a few releases, I have had to cold boot to
get dhclient athn0 working on an ar9280 in client mode.

Since my latest upgrade to a snapshot of Jun 17 kernel #275 with the previous
kernel being from Jun 2nd #237. I seem to have to cold boot after running
ifconfig athn0 down and then back up, where I'm *fairly* sure that I didn't need
to before that Jun 17th upgrade. ifconfig debug mode shows the wireless
handshake completing 4/4. Yet dhclient can't establish a link until cold booted.
A warm reboot does not resolve the problem.

Has anyone else seen this or can reproduce it?

I'll try a sysupgrade in the meantime but I'm not sure there has been any code
changes in areas that could resolve it.

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