auto-switch DHCP rc.conf(5) directive to SYNCDHCP if devd(8) won't take over
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Authored by hs.freebsd_id.omnilan.de on Tue, Sep 17, 9:23 AM.

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Summary

Network interface configuration setting "DHCP" in vnet enabled jails has no effect, which is not what users can expect.
Instead of extending the synchronous_dhclient documentation in rc.conf(5) and explaining why/that "SYNCDHCP" is required in jails instead of "DHCP" in vnet jail(8), I'd prefer to have rc(8) taking care about devd(8) state, which is the actual reason why we need SYNCDHCP in vnet jails.
See also https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280913

Test Plan

I'm using the patched /etc/rc/network.subr on some production system hosts and in their jails for almost a month now without issues and the expected effect.