Strange ICMP

Hi,
 
I am detecting an increased amount of ICMP Ping traffic. The strange
thing is that there are several sources that are hitting us about 1000
times a week. All of these sources have a last octet of some form of 36
and 37.
 
63.163.102.36 & 37
216.34.77.36 & 37
64.209.232.36 & 37
61.213.167.236 & 237
193.95.144.136 & 137
 
These are from different ISPs and in a couple countries. The destination
is on a Cable Modem that has no inbound access. It's not causing an
issue, it's just anomalous.

Anyone else seeing this kind of traffic, or have any ideas on the
origin?


Ron Shuck, CISSP, GCIA, CCSE - Managing Consultant
Buchanan Associates - A Technology Company in the People Business
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