Route
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... one or more DHCP servers. This enables the security gateway to route
the corresponding DHCPOFFER message(s) back to the remote host ...
... To learn the internal IP address of the client in order to route
packets to it, the security gateway will typically snoop ...
... snoop the yiaddr
field within the DHCPACK and plumb a corresponding route as part of
DHCP Relay processing.
...
... cases, implementations MAY devise a mapping between the xid, chaddr,
and tunnel in order to route the DHCP server response to the
appropriate tunnel endpoint ...
... Lemon, T., Cheshire, S. and B. Volz, "The Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP)", RFC 3442prop ...