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

ip irdp

• Use to enable IRDP processing on an interface.
• Example

  host1(config-if)#ip irdp

• Use the no version to disable the function.
• See ip irdp

ip mask-reply

• Use to enable ICMP netmask reply.
• Example

  host1(config-if)#ip mask-reply

• Use the no version to disable the function.
• Seeip mask-reply

ip redirects

• Use to enable the sending of redirect messages if software is forced to resend a packet through the same interface on which it was received.
• Example

  host1(config-if)#ip redirects

• Use the no version to disable the sending of redirect messages.
• See ip redirects

ip unreachables

• Use to enable the generation of an ICMP unreachable message when a packet is received that the router cannot deliver.
• Example

  host1(config-if)#ip unreachables

• Use the no version to disable the function.
• See ip unreachables

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