My 6500 with my IDSM2 is connected to my Internet router so all traffic to and from the Internet passes through to the hosts at the access layer (obviously). I constantly see ICMP Unreachable traffic crossing the IDSM2 from various foreign countries to various internal subnets. I have captured this traffic in a packet capture but it doesn't tell me anything usseful. Sometimes it is just one or two packets, sometimes its a lot more. Can anyone explain why I am seeing this traffic and what I should do about it?