May 2006
Intermediate to advanced
480 pages
12h 20m
English
Content preview from Understanding TCP/IPBecome 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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5.4 Optional Entries in the IP Header
Optional entries in the IP header are one of the more interesting facets of TCP/IP protocols. We will demonstrate how dangerous it can be to use optional entries, and why many Internet providers throw away IP datagrams that contain them. However, from the pure TCP/IP protocol point of view, this practice is inexcusable (even if performed in good faith), and it can be compared to requiring everyone to carry crutches in case they break their leg.
If a recipient receives an IP datagram with any of these options, it should also use the option in its reply. Optional entries widen the IP header. Due to the IP header’s maximum length of 60 B (out of which 20 B is mandatory), the optional entries are limited to 40 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.