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  1. Hello Rene ,

    I have below doubt regarding ICMP error codes as below for type 3:

    • 0 - Destination network unreachable
    • 1 - Destination host unreachable
    • 6 - Destination network unknown
    • 7 - Destination host unknown

    These all seem to be same. Can you please differentiate all code values and for which scenario each one is generated?

    Thank You!!

    Regards,
    Sameer

  2. Hi Sameer,

    The RFC has a detailed explanation for these error codes. Sometimes these are hard to find but here’s a good example:

    https://tools.ietf.org/html/rfc1812#page-81

    0 = Network Unreachable - generated by a router if a forwarding path (route) to the destination network is not available;

    1 = Host Unreachable - generated by a router if a forwarding path (route) to the destination host on a directly connected network is not available (does not respond to ARP);

    6 = Destination Network Unknown - This code SHOULD NOT be generated since it would imply on the p

    ... Continue reading in our forum

  3. Hi Rene ,

    Thank you!! , I tested to get these codes but only seen “Type 3 Code 1” ,may be these are not implemented thank you for details hints .

    Regards,
    Sameer.

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