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  • Hirofumi Takahashi thinks this is interesting:

  • Record route provides room for each router to enter the address of its outgoing interface as the packet transits so that a record is kept of all routers the packet encounters. Record route provides a function similar to trace except that the outgoing interfaces, both on the path to the destination and on the return path, are recorded.

  • Timestamp is an option similar to record route except each router also enters a timestamp: the packet not only keeps track of where it has been but also records when it was there.

  • From

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

    Note

    IP Header Option Field