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e52a6f0149 1 1 1 1 1 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ B MBZ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ B: BROADCAST flag MBZ: MUST BE ZERO (reserved for future use) Figure 2: Format of the 'flags' field 2.1 Configuration parameters repository The first service provided by DHCP is to provide persistent storage of network parameters for network clients. Errata Exist. Furthermore, DHCP is generally intended to make maintenance of remote and/or diskless hosts easier. To help ensure that any BOOTP relay agents forward the DHCPREQUEST message to the same set of DHCP servers that received the original DHCPDISCOVER message, the DHCPREQUEST message MUST use the same value in the DHCP message header's 'secs' field and be sent to the same IP broadcast address as the original DHCPDISCOVER message. Distribution of this memo is unlimited. The format of DHCP messages is based on the format of BOOTP messages, to capture the BOOTP relay agent behavior described as part of the BOOTP specification [7, 21] and to allow interoperability of existing BOOTP clients with DHCP servers. .45 List of Figures 1.
Any DHCPACK messages that arrive with an 'xid' that does not match the 'xid' of the client's DHCPREQUEST message are silently discarded. Gilmore, "Bootstrap Protocol (BOOTP)", RFC 951, Stanford and SUN Microsystems, September 1985. The values to be passed in an 'option' tag may be too long to fit in the 255 octets available to a single option (e.g., a list of routers in a 'router' option [21]). Under normal circumstances, the network manager should not have to enter any per-client configuration parameters. This corresponds to moving to BOUND state in the client state transition diagram shown in figure 5. A server is free to choose some other subnet, and it is beyond the scope of the DHCP specification to describe ways in which the assigned IP address might be chosen. 1.1 Changes to RFC 1541 This document updates the DHCP protocol specification that appears in RFC1541. If 'giaddr' is 0x0 in the DHCPREQUEST message, the client is on the same subnet as the server.
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