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.

For example, you can specify that ICMP use Fast Ethernet interface 1 in slot 0 as the source for any messages that it sends:

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.

ip icmp update-source

• Use to define an update source address for all ICMP messages that the E-series router generates from the specified interface.
• Example

  host1(config)#ip icmp update-source 192.35.42.1

• Use the no version to disable the function.
• See ip icmp update-source

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