Cisco IOS IPS?

Hello

I'm currently studying PSAB NSS by Greg Bastien. I have the following lab scenario and would like clarification on what I see. I want to check the functioning of my installation of IPS, so I ran "angry ip" ip address/port scan on the router. "When I use ' statistical property sh industrial ips I see ' packets 3051:1 verified signature: [0:1]" which means by ' TCP connection window size back ATOMIC. TCP "."

Is this signature 3051 an indication that the router has seen the scan of IP? and it considered a reconnassaince attack. Are there other ways to check the attack of?

Hello

If you see signing warning messages, then that means there is a match and IPS triggers an alert message which is the default setting of a signature.

In your case, it means only that the signature of 3051:1 saw a package matching, so he comes to save the information. For this signature to the fire (which means for IP addresses identify an attack, he must check the other settings as well).

If you look into the details of the definition of this signature, it has a global analytical threshold and interval summary settings. Which means the PPE must see this signature are in the interval of summary for the number of times defined in the analytical threshold, then it will validate a signature match, so send the alarm and perform actions defined in the signature.

In your case, it shows that there is a corresponding signature packet. You might be able to find more information, if you run a sniff and capture your ' angry ip' traffic sent to the router. "

Thank you

-Chris

Tags: Cisco Security

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