January 2008
Intermediate to advanced
624 pages
14h 16m
English
Content preview from Windows Server® 2008 TCP/IP Protocols and ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The UDP Pseudo Header
The UDP pseudo header associates the UDP message with its IP header. UDP adds the UDP pseudo header to the beginning of the UDP message only for the checksum calculation; it is not sent as part of the UDP message. The UDP pseudo header assures the receiver that a routing or fragmentation process did not improperly modify key fields in the IP header.
Figure 9-4 shows the UDP pseudo header.
The UDP pseudo header consists of the Source IP Address field, the Destination IP Address field, an Unused field set to 0, the Protocol field for UDP (17 or 0x11), and the UDP Length field. When sending a UDP message, UDP is aware of all of these values. When receiving a UDP message, IP indicates all of these values to UDP.
Figure 9-4. The ...
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