[Snort-users] ICMP Echo Replies & Unknowns?

Matthew Collins Matthew.Collins at ...1681...
Thu Jun 28 05:43:28 EDT 2001

I get all sorts of this stuff too, also ICMP destination unreachable messages for packets we haven't sent. Most of this is fallout from DOS attacks & people spoofing our IP addresses.

>>> "Sheahan, Paul (PCLN-NW)" <Paul.Sheahan at ...2218...> 28/06/01 05:59:48 >>>

Every day, I see many "ICMP Echo Replies" and "ICMP unknowns" from random
machines on the Internet.
Some example traces are below...these packets came back to back three
seconds apart (icmp unknown then icmp echo reply right afterward). Does
anyone know why I would see so many of these? Could this come from a probing
tool? I see so many, I'm trying to figure out what's going on! Thanks.

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