Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

Option	Number and Description
Subnet Mask	Option 1 Specifies the client’s subnet mask.
Router	Option 3 Specifies the router IP addresses that may serve as the client’s default gateway.
Domain Name Server	Option 6 Specifies the domain name servers (DNSs) that are available to the client.
Domain Name	Option 15 Specifies the domain name that clients should use when resolving hostnames via DNS.
IP Address Lease Time	Option 51 Specifies the amount of time that the client is allowed to use an assigned IP address.
DHCP Message Type	Option 53 1: DHCPDISCOVER 2: DHCPOFFER 3: DHCPREQUEST 4: DHCPDECLINE 5: DHCPACK 6: DHCPNACK 7: DHCPRELEASE 8: DHCPINFORM
Parameter Request List	Option 55 Clients use this option to tell the server which parameters it requires. It is a series of octets where each octet is DHCP option code.
Renewal Time	Option 58 Specifies the amount of time after the IP address is granted that the client attempts to renew its lease with the original server.
Rebinding Time	Option 59 Specifies the amount of time after the IP address is granted that the client attempts to renew its lease with any server, if the original server does not respond.
End	Option 255 Signals the last option in the DHCP packet.

DHCP Packet Format and Options