Port 0 is not blocked the victim

We were see switchis sig alerts with gravity high and port 0 that are not blocked by IPS of the victim. All other ports are blocked are the same sig alert. I understand that port 0 is not valid port for traffic, but I read some articles which suggests there have been reports of port 0 being used to test and/or DDoS attacks. We do not know whether we should change the rule of action to block port 0 or if it is still possible.

Information or suggestions on this subject are welcome.

You have a sample alert you can share - strip anything sensitive (ip, data context, etc.)... I suspect that you see a summary alert when the port gets zeroed - in the alert, you will see that there is indication 'summary' - individual alerts consumed by the alert of synthesis would be to drop packets if it was the action that is affected.

Tags: Cisco Security

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