March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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TCP path MTU discovery
While the forwarding semantic associated with the IP header allows any transit node to fragment the packet, it may create performance issues (as mentioned in the previous section) as the receiver is required to re-assemble the packets before processing. We could force the transit node to not fragment the packet but instead signal the presence of a lower MTU in the path and let the originator adjust the MSS. This process is known as Path MTU Discovery (PMTUD) and is an efficient way of detecting the lowest MTU along the path and using the value to adjust the MSS for efficient data transmission.
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