What to expect with the actions 'pair of log '.

I've never quite understood what I would expect to find in the OCAP for action file "newspaper pair packets. Consider the following example:

Hamid: 6256-0 (HTTP authentication failed)

Engine: Atomic IP

Mask TCP: Ack, Rst, Syn

TCP flags: Ack

Source Port range: 80-80

Regex: [Hh] [Tt] [Tt] [Pp] [/] [1] [.] [01] [\t] [4] [0] [1]

Number of events: 25<-not>

Number of key events: attacking and addresses the victim

Alert interval: 2<-not>

What I would expect / hope to see is at least all 25 "atomic" packets that triggered the alarm. This doesn't seem to be the case however.

A search string using the OCAP (ethereal) of "401" file is only 5 hits... and all but one are separated by more than 5 seconds.

The first package in the pcap file match the signature (i.e. a 401). Is the first packet in the file OCAP the last packet that triggered the alarm?

In short, Yes. Keep in the recording of mind is only started after the alert has triggered, which in your case would be ONCE we see the 25 package within a period of 2 seconds. Actually we will capture this one 25 because it is the TriggerPacket as you said, most everything that happens after TriggerPacket, but we don't capture/log all packets of 25, simply because for the package from 1 to 24 the alert did not.

Tags: Cisco Security

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