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Master Course Computer Networks IN2097 - TUM

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Step 2) Prevent State from being closed<br />

q� If requester sends ICMP unreachable as a response to a<br />

received UDP packet for a non-existing state (1)<br />

and Service removes mapping on ICMP unreachable in (2)<br />

try to set a lower TTL (3)<br />

(3)<br />

(2)<br />

(1)<br />

Network <strong>IN2097</strong> - <strong>Master</strong> Security, <strong>Course</strong> WS 2008/09, <strong>Computer</strong> Chapter <strong>Networks</strong>, 9 WS 2012/2013 54

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