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There's a lot here; you should open a Support ticket for these questions.
DHCP will not pass over a VPN. It's a broadcast (0.0.0.0 -> 255.255.255.255) so it doesn't leave the 'local network' (the DHCP Relay agent, which does pass DHCP broadcasts and replies, does not work over a VPN). DNS will work though.
Thanks I will open a ticket.