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Option DHCPOFFER DHCPACK DHCPNAK
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Requested IP address MUST NOT MUST NOT MUST NOT
IP address lease time MUST MUST (DHCPREQUEST) MUST NOT
MUST NOT (DHCPINFORM)
Use 'file'/'sname' fields MAY MAY MUST NOT
DHCP message type DHCPOFFER DHCPACK DHCPNAK
Parameter request list MUST NOT MUST NOT MUST NOT
Message SHOULD SHOULD SHOULD
Server identifier MUST MUST MUST
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