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ICMP Type:8 Code:137

Subject: ICMP Type:8 Code:137
Date: 28 Oct 2005 03:12:09 -0000
We have been seeing a good number of ICMP - echo requests coming in bursts 
having a code of 137 in the last couple of days.  The burst do not last long 
but are sometimes preceeded by a traceroute.  No other traffice follows from 
the source hosts.  There is no payload in the packets.  My research into what 
or why this is happening has turned up nothing. 

Has any one heard of any attacks or recon using this code?  

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