router rip
network 172.16.0.0
network 192.168.12.0
19.2 IP Service Configuration
19.2.1 IP Services Configuration Task List
IP service configuration includes the following tasks which are all optional. You can perform
IP connection management according to the actual requirement.
19.2.2 IP ConnectionsManagement
The IP protocols stack offers lot of of services to control and manage IP connections.
Internet Control Message Protocol (ICMP) provides many of these services. When there is
any problem with the network, the router or access server will send an ICMP message to the
host or other routers. For detailed information on ICMP, see RFC 792.
To manage various aspects of IP connections, perform the optional tasks described in the
following sections:
Enabling ICMP Protocol Unreachable Messages
Enabling ICMP Redirect Messages
Enabling ICMP Mask Reply Messages
Setting the IP MTU
Configuring IP Source Routing
19.2.2.1 Enabling ICMP Protocol Unreachable
Messages
When the device receives a non-broadcast packet that the destination is itself, and this
packet uses the IP protocol that the router cannot process, the router will send 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 re-enable this ICMP protocol unreachable message, use the following command in
interface configuration mode:
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