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  • Hirofumi Takahashi thinks this is interesting:

Given a sequence number space n and two sequence numbers a and b, a is considered more recent (of larger magnitude) in either of the following situations:

     a > b, and (a – b) ≤ n/2     a < 

From

Cover of Routing TCP/IP, Volume 1, 2/e

Note

How to find more recent sequence number for circular sequence number space