This memo defines a new suboption of the DHCP relay information

option that allows the DHCP relay to specify a new value for the

Server Identifier option, which is inserted by the DHCP Server. This

allows the DHCP relay to act as the actual DHCP server such that

RENEW DHCPREQUESTs will come to the relay instead of going to the

server directly. This gives the relay the opportunity to include the

Relay Agent option with appropriate suboptions even on DHCP RENEW

messages.