January 2001
Intermediate to advanced
368 pages
11h 35m
English
Content preview from IP Quality of Service
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316 Appendix E: General IP Line Efficiency Functions
To determine the Path MTU, the source station sends out large packets with a DF (Don’t
Fragment) bit set in the IP header to the destination. When a router or a switch along the
path needs to switch the packet to a link that supports a lower MTU, it sends back a “Can’t
Fragment” Internet Control Message Protocol (ICMP) message to the sender. A sender that
receives a “Can’t Fragment” ICMP message lowers the packet size and tries to discover the
Path MTU once again. When a sender no longer receives the “Can’t Fragment” ICMP
message, the MTU size used by the sender becomes the Path MTU.
The ip tcp ...
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