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A type of [ICMP] packet. It is used to dynamically reconfigure routing to be more optimal. If a host <tt>src</tt> sends an [IP] packet to <tt>dst</tt> via router <tt>rtr1</tt>, and <tt>rtr1</tt> finds that it has to send it back out to router <tt>rtr2</tt> from the same interface, then <tt>rtr1</tt> might send an [ICMPRedirect] to <tt>src</tt> to notify it that it should send packets for <tt>dst</tt> directly to <tt>rtr2</tt> instead of sending them to <tt>rtr1</tt>. Obviously, [ICMPRedirect] messages have great potential for abuse, as they can allow an attacker to cause a machine to send its [IP] traffic to a host of the attacker's choosing.
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