[Bug 255830] dummynet(4) queues/pipes do not work inside of a VNET jail

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255830

--- Comment #10 from Joshua Kinard <freebsd@kumba.dev> ---
(In reply to Peter Much from comment #9)

I'd give the jailed VNET router another try.  It has been working fine on my
end for a few months now (since ~13.1-BETA2).  Just give the jail the external
WAN interface and internal LAN interface and configure as normal.  The host
should listen on a third interface with a different address than the jail (my
router has six gigabit interfaces to play with).

Only bug I've still got to hunt down is when the jail starts at boot, it
sometimes fails to pull an address from my ISP even though I have SYNCDHCP set.
 Easy fix to just restart netif em0 in the jail when it happens.  I should
debug it, though and figure out how to really fix it.  I even have my wlan0
interface assigned to the jail and run hostapd out of it to run the wifi on a
separate subnet.  Needs a small tweak to hostapd's rc script to let it run into
a jail (see #263359).

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