[Bug 193681] kernel panic: dhclient NULL pointer in ether_output_frame() when using dummynet at layer2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193681

--- Comment #7 from Kate <kate at elide.org> ---
#
#
# ifconfig wlan0 create wlandev ath0
wlan0: Ethernet address: c4:93:00:00:3c:c9
# sysctl net.link.ether.ipfw=1
net.link.ether.ipfw: 0 -> 1
# sysctl net.link.bridge.ipfw=1
net.link.bridge.ipfw: 0 -> 1
# ipfw add 100 pipe 1 ip from any to any layer2
00100 pipe 1 ip from any to any layer2
# ipfw pipe 1 config
# dhclient arge0
DHCPDISCOVER on arge0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on arge0 to 255.255.255.255 port 67 interval 21
...

Thanks! The HardenedBSD patch seems good to me. I have no idea if it's the
right thing to do or not, but with the patch I'm unable to produce the panic.

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