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    Specifying a Source Address for ICMP Messages

    By default, ICMP uses the IP address of the outgoing interface as the source IP address for the ICMP message. However, you can use the ip icmp update-source command to instruct ICMP to use an already configured interface or a specified IP address, as the source address of the ICMP message.

    You must use an already configured interface or an existing IP address when using the ip icmp update-source command. Also, you cannot specify a multicast address when using this command.

    To define an update source address for all ICMP messages that the E Series router generates from the specified interface:

    • Issue the ip icmp update-source command in Global Configuration mode.
      host1(config)#ip icmp update-source

      Use the no version to disable the function.


    Published: 2014-08-13