Siemens RUGGEDCOM ROX II, User Manual

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Chapter 13
Unicast and Multicast Routing
RUGGEDCOM ROX II
CLI User Guide
438 Configuring ICMP
Parameter Description
The number of free ordinary blocks (in bytes).
This parameter is mandatory.
Section 13.4
Configuring ICMP
To configure how RUGGEDCOM ROX II manages ICMP redirect messages, do the following:
1. Make sure the CLI is in Configuration mode.
2. Navigate to
admin and configure the following parameter(s) as required:
NOTE
ICMP redirect messages are sent by routers to hosts to inform them when a better route is
available for a particular destination. However, before enabling RUGGEDCOM ROX II to send ICMP
messages, be aware that ICMP redirects are simple to forge, allowing attackers to control the path
by which packets are forwarded, and are sometimes considered a security risk. Send ICMP redirect
messages only when appropriate.
Parameter Description
ignore-icmp-all Synopsis: { true, false }
Default: false
Ignores all ICMP echo requests sent to it.
ignore-icmp-broadcast Synopsis: { true, false }
Default: true
Ignores all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast.
send-icmp-redirect Synopsis: { true, false }
Default: true
Sends the ICMP redirect.
3. Type commit and press Enter to save the changes, or type revert and press Enter to abort.
Section 13.5
Managing Event Trackers
Trackers monitor the availability of hosts or devices by periodically transmitting ICMP messages (or pings). Based
on the ICMP results, the tracker updates operational data with the status of the host or device as it changes (i.e.
between "up " and "down" states). Other parts of the system can then subscribe to the operational data to be
notified when changes take place.
Where available, a tracker can allow a user greater flexibility when configuring a feature. For example, advertised
or received routes can be filtered or blocked entirely, based on the status of the tracker.