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IP Interface Configuration
other routers when a problem is discovered with the Internet header. For detailed information on
ICMP, see RFC 792. SmartWare supports following ICMP message processing features:
•
ICMP redirect messages
•
Router advertisement broadcast message
12.7 ICMP Redirect Messages
Routes are sometimes less than optimal. For example, it is possible for the router to be forced to
resend a packet through the same interface on which it was received. If the router resends a packet
through the same interface on which it was received, the SmartWare application software sends an
ICMP redirect message to the originator of the packet telling the originator that the router is on a
subnet directly connected to the receiving device, and that it must forward the packet to another
system on the same subnet. The software sends an ICMP redirect message to the originator of the
packet because the originating host presumably could have sent that packet to the next hop without
involving this device at all. The redirect message instructs the sender to remove the receiving device
from the route and substitute a specified device representing a more direct path. This feature is
enabled by default.
The SmartWare ICMP message processing offers two options for host route redirects:
•
accept
which accepts ICMP redirect messages
•
send
which sends ICMP redirect messages
Procedure
To enable the sending or accepting of ICMP redirect messages on interface
name
, if this feature was
disabled
Mode
Interface
Command Purpose
Step 1
node
(ctx-ip)[router]#interface
name
Selects interface
name
for ICMP message
processing configuration
Step 2
node
(if-ip)[
name
]#icmp redirect
{ accept | send}
Enables sending or accepting of ICMP redirect
messages
Example: ICMP Redirect Messages
The following example shows how to configure ICMP messages processing to accept ICMP redirect
messages on IP interface
lan
. Use the following commands in IP context configuration mode.
SN(ctx-ip)[router]#
interface lan
SN(if-ip)[lan]#
icmp redirect accept
12.8 Router Advertisement Broadcast Message
This message configures the behavior of the router when receiving an ICMP router solicitation
messages, and determines if the router shall send periodic ICMP router advertisement messages or
not.
By default ICMP router advertisement messages are sent, either as a reply for ICMP router
Software Configuration Guide, Revision 1.03
solicitation messages or periodically. If the feature is disabled ICMP router advertisement messages
are not sent in any case, neither as a reply for ICMP router solicitation messages nor periodically.
Summary of Contents for SmartWare R2.00
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