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    Configuring ICMP Tasks

    You can enable the following ICMP features:

    • ICMP Router Discovery Protocol (IRDP)
    • ICMP netmask reply
    • Sending of IP redirects
    • Generation of ICMP unreachable messages

    Note:

    • Before you configure IP, you must create the lower-layer interfaces over which IP traffic flows.
    • All IP configurations will be removed from the interface when you issue the no ip interface command in Interface Configuration mode.

    To configure the ICMP features:

    • Enable IRDP processing on an interface.
      host1(config-if)#ip irdp

      Use the no version to disable the function.

    • Enable ICMP netmask reply.
      host1(config-if)#ip mask-reply

      Use the no version to disable the function.

    • Enable the sending of redirect messages if software is forced to resend a packet through the same interface on which it was received.
      host1(config-if)#ip redirects

      Use the no version to disable the sending of redirect messages.

    • Enable the generation of an ICMP unreachable message when a packet is received that the router cannot deliver.
      host1(config-if)#ip unreachables

      Use the no version to disable the function.

    Published: 2014-08-13