2.2.4 DHCP Failover Option 33 (0x21) – Client Subnet Mask Option
The Client Subnet Mask option is used to convey the subnet mask of the DHCPv4 client in the lease update that is being synchronized with the partner server.
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OptionCode |
OptionLength |
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OptionCode (2 bytes): This field MUST be set to 33 (0x21).
OptionLength (2 bytes): This field MUST be set to 0x04.
OptionValue (variable): This field contains the IPv4 addresses in network byte order.