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DES-7200 Configuration Guide Chapter 1 IP Address and Service
Configuration
1-12
To manage various aspects of IP connections, perform the optional tasks
described in the following sections:
z Enabling ICMP Protocol Unreachable Messages
z Enabling ICMP Redirect Messages
z Enabling ICMP Mask Reply Messages
z Setting the IP MTU
z Configuring IP Source Routing
1.2.2.1 Enabling the ICMP Protocol
Unreachable Message
When a router receives a non-broadcast packet destined to it, and this packet
uses an IP protocol that it cannot handle, it will return an ICMP protocol
unreachable message to the source address. Similarly, if the router is unable to
forward the packet because it knows of no route to the destination address, it
sends an ICMP host unreachable message. This feature is enabled by default.
To enable this service, execute the following command in the interface
configuration mode:
Command Function
DES-7200(config-if)# ip unreachables
Enable the ICMP protocol unreachable
and host unreachable messages.
DES-7200(config-if)# no ip
unreachables
Disable the ICMP protocol unreachable
and host unreachable messages.
1.2.2.2 Enabling the ICMP Redirect
Message
Routes are sometimes less than optimal. For example, it is possible for the
device to be forced to resend a packet through the same interface on which it
was received. If the device resends a packet through the same interface on
which it was received, it sends an ICMP redirect message to the originator of
the packet telling the originator that the gateway to this destination address is
another device in the same subnet. Therefore the originator will transmit the
packets based on the optimized path afterwards. This feature is enabled by
default.
To enable the ICMP redirect message, execute the following command in the
interface configuration mode:
Command Function
DES-7200(config-if)# ip redirects
Enable the ICMP redirect message. It is
enabled by default.