Practical Packet Analysis, 3E: Using Wireshark to Solve Real-World Network Problems by Chris Sanders

Author:Chris Sanders [Sanders, Chris]
Language: eng
Format: azw3
ISBN: 9781593278021
Publisher: No Starch Press
Published: 2017-03-30T04:00:00+00:00

DHCP Options and Message Types

DHCP’s real flexibility lies in its available options. As you’ve seen, the packet’s DHCP options can vary in size and content. The packet’s overall size depends on the combination of options used. You can view a full list of the many DHCP options at http://www.iana.org/assignments/bootp-dhcp-parameters/.

The only option required in all DHCP packets is the Message type option (option 53). This option identifies how the DHCP client or server will process the information contained within the packet. There are 8 message types, as defined in Table 9-1.

Table 9-1: DHCP Message Types

Type number

Message type

Description

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