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FAQ: What is Record Route Option?

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Article ID: KB6970 KB Last Updated: 20 Aug 2010Version: 4.0
Summary:
FAQ: What is Record Route Option?
Symptoms:

Environment:

  • Record Route Option
  • Screen Option
  • IP 7
  • RFC791
Solution:

Recorded Route Option: This option is used to trace the route an Internet datagram takes. Abstracted from RFC 791, pg. 20, 21.

The record route option provides a means to record the route of an Internet datagram. When an Internet module routes a datagram it checks to see if the record route option is present. If it is, it inserts its own Internet address as known in the environment into which this datagram is being forwarded into the recorded route beginning at the byte indicated by the pointer, and increments the pointer by four. 

If the route data area is already full (the pointer exceeds the length) the datagram is forwarded without inserting the address into the recorded route. If there is some room but not enough room for a full address to be inserted, the original datagram is considered to be in error and is discarded. In either case an ICMP parameter problem message may be sent to the source host. Not copied on fragmentation, goes in first fragment only. Appears at most once in a datagram.

Additional Information:

For How NetScreen Device Handle Record Route Option, please refer to KB6969

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