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  • Hirofumi Takahashi thinks this is interesting:

Given two numbers a and b and a sequence number space n, b is more recent than a if and only if

a < 0 and a < b, or

a > 0, a < b, and (ba) < ...


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


Formula for Lollipop-Shaped Sequence Number Spaces