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[ScreenOS] What does 'Drop Embedded ICMP' in get flow mean?

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Article ID: KB22927 KB Last Updated: 01 Oct 2014Version: 2.0
Summary:

This article provides information about the meaning of 'Drop Embedded ICMP' in get flow.

Symptoms:

What is the meaning of 'Drop Embedded ICMP' in get flow?

Cause:

Solution:

ICMP error messages are echoed back to the source whenever there are conditions such as network unreachable, host unreachable, port unreachable, fragmentation needed, and so on. These error messages always contain the IP header, along with the first 8 bytes of the original datagram's data that caused the error. Such packets are known as embedded ICMP packets.

For example, the following capture, via Wireshark, displays the Destination Port Unreachable(Type=3,Code3) embedded ICMP error message:



To drop such ICMP embedded packets, run the following command:

set flow drop

To unset, run the following command:

unset flow drop

To check the current settings, run the get flow command (as shown in the following image):





Note: This command runs only on the 6.3 release.
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