Avici Systems Inc.

ip unreachables

Enables/disables ICMP unreachable messages on the interface.

Syntax: [no] ip unreachables

Description: If the router receives a non-broadcast packet destined for itself that uses an unknown protocol, it sends an ICMP Protocol Unreachable message back to the source. Similarly, if the router receives a packet that it is unable to deliver to the ultimate destination, because it knows of no route to the destination address, it sends an ICMP Host Unreachable message to the source. This feature is enabled by default.

Use the ip unreachables command to enable the router to send an ICMP unreachable message to the source if the router receives a packet that has an unrecognized protocol or no route to the destination address.

Use the no ip unreachables command to disable sending ICMP unreachable messages.

Factory Default: Enabled.

Command Mode: Interface configuration.

Example: In the following example, the ip unreachables command enables sending of ICMP messages on interface POS 1/1/1:

router#config terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config)#interface pos 1/1/1

router(config-if)#ip unreachables


Related Commands: interface


Copyright © 2004 Avici Systems Inc.
Avici® and TSR® is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are trademarks of Avici Systems Inc.

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