Configuring ICMP Tasks

You can enable the following ICMP features:

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.