- Number of packets that Snort receives from one destination only
- Number of packets that Snort receives from all senders
- The time between two received packets
I'm not sure why you'd need to collect "the time between two received packets." Snort doesn't keep a record of every received packet unless you specifically instruct it to do so. Under Snort's primary settings, you consequently wouldn't be able to determine the time difference between two arbitrary packets. Tools like tcpdump run on the host, however, and should be able to address this third area.
Snort is an intrusion detection system, so the real question you should be asking is, "What type of unusual events does Snort detect on my network?" On any network using an IDS for the first time, you'll likely find a number of false positive reports. Your next question should then be, "Which of those alerts can I safely ignore?" Once you have the answers to those questions in hand, you can use Snort as part of your ongoing routine to monitor the network for potential security events.
Dig Deeper on Network intrusion detection and prevention (IDS-IPS)
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