[Bug 280913] [patch] Unexpected state of vnet-jails with ifconfig_DEFAULT="DHCP" in rc.conf(5)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280913

crest@rlwinm.de changed:

           What    |Removed                     |Added
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                 CC|                            |crest@rlwinm.de

--- Comment #1 from crest@rlwinm.de ---
As you already identified the problem is that ifconfig_<name>="... DHCP"
doesn't work inside a vnet jail.

The reason for this is that DHCP instead of SYNCDHCP relies on devd to respond
to link up events and which is impossible inside a jail since it would require
opening /dev/devctl inside the jail to get events into the kernel and that
device support only one opening at a time (like tun and tap device).

You have to use SYNCDHCP inside the jail or configure the host's devd to match
on the jail interface name(s) with a higher priority than the default rules to
make async DHCP work and use jexec to run the same script inside the correct
jail with jexec.

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