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What is the IP Timestamp Option?



Article ID: KB4723 KB Last Updated: 09 Jun 2010Version: 3.0
What is the IP Timestamp Option?


Note: This article applies to ScreenOS 4.0 and higher.

The NetScreen device detects packets where the IP option list includes option 4 (Internet Timestamp) and records the event in the SCREEN counters list for the ingress interface.

The IP Timestamps Option records the time (in Universal Time) when each network device receives the packet during its trip from the point of origin to its destination. The network devices are identified by IP number. This option develops a list of IP addresses of the routers along the path of the packet and the duration of transmission between each one. If the destination host is a compromised machine in the attacker's control, he or she can glean information about the topology and addressing scheme of the network through which the packet passed.

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