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Internet Protocol. Source Routing. RFC 791. Are the addresses in the Source Routing option 1-indexed?

Last updated on December 26, 2018

        I was reading pages 18-21 in <a href="http://www.ietf.org/rfc/rfc791.txt" rel="nofollow">RFC 791</a> about the Internet Protocol and in the sections on Loose Source and Record Route (LSRR), and Strict Source and Record Route (SSRR), and Record Route (RR) it says that the smallest value for the pointer is 4.  To confirm my understanding of how this pointer works - is it really 1-indexed?

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