It works by adding daemon_rtable=$id in /etc/rc.conf.local.
rcctl(8) support coming in a few and so are the man pages bits.
If you want multiple instances of the same daemon running in different
routing tables, just symlink the original rc.d script.
e.g.
# cd /etc/rc.d && ln -s dhcpd dhcpd42
Then enable your daemons as such in rc.conf.local:
dhcpd_flags=
dhcpd42_flags=
dhcpd42_rtable=42
most work done by Jiri B <jirib@devio.us>; with a few tweaks and simplifications
by yours truly
ok robert@
... should make henning happy ;-)