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.
IP Header Option Field
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