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200-301 ocg

    200-301 ocg

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  • ICMP ,200-301 ocg, IGMP , UDP, and TCP all use the same checksum algorithm, although TCP and UDP include different fields in the IP header in addition to their own headers and data . In RFC 1071 [Braden, Borman and Patridge 1988] , there are implementation techniques on how to calculate Internet checksums. Because routers often only modify the TTL field (minus 1 ), when the router forwards a packet, it can increase its checksum without recalculating the entire IP header. RFC 1141 [Mallory and Kullberg 1990] gives a very effective method for this. The option field is always limited to 32 bits , and padding bytes with a value of 0 are inserted when necessary . This ensures that the IP header is always an integer multiple of 32 bits (this is required by the header length field).

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