too many ICMP unreachable/exceeded

Hello

I have a problem here pix 506th and my network is slow to death this 3 days, when I have terminal monitor (debug mode) I saw there was a lot of icmp unreachable and exceeded from unknown ip, over 30 different ip detected. but that suppose to be right ID information? not that kind of attack. Any possible cause of this problem?

Thank you

Hello, there are a lot of reasons.

Are you sure there's no worm in your network?

ICMP unreachable means you sent an IP packet to a machine that does not have the open TCP/UDP port. Who can be the result of a worm track scan of IP addresses for vulnerabilities and internet hosts meet.

Time exceeded ICMP can occur after a traceroute or IP routing loops. There is nothing you can do on the loops in the internet.

I hope this helps! Please note all messages.

Regards, Martin

Tags: Cisco Security

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