BOOTP Message Format

The exchange of information in BOOTP takes the form of a request sent by a client and a reply sent back by the server. BOOTP, like a number of other request/reply protocols, uses a common message format for requests and replies. The client starts by setting aside memory space for the message and clearing it to all zeros. It then fills in the fields of the message and sends the request, as you saw in the previous section. The server creates its reply not from scratch, but by copying the request and changing certain fields.

BOOTP messages contain a considerable number of fields, so the message format is rather large. It is described in Tables Table 60-1 and Table 60-2, and illustrated in Figure 60-3.

Table 60-1. BOOTP Message ...

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