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Sure, I suggest a read of the "Protocol Flow Analyzer" Whitepaper at
http://www.snort.org/docs/#devel. It may fill in some blanks for you.
(Generally, I suggest everyone take a look at the 4 whitepapers at the
above link starting with "Snort 2.0" (yes they are still valid).
Please go take a look at these, they will explain alot for you!)
Joel
Elias Athanasopoulos wrote:
Hello!
I am using stream4 with the configuration below:
preprocessor stream4: disable_evasion_alerts, keepstats machine
preprocessor stream4_reassemble: both, ports:all
However, in the session.log file I have a lot of records *but not all*
with zero bytes in the Client side, in the Server side or both.
For example:
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
67.70.68.8 port: 63960 pkts: 1 bytes: 0] [Client IP: 147.52.78.17 port:
2213 pkts: 1 bytes: 0]
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
147.52.136.3 port: 4662 pkts: 2 bytes: 0] [Client IP: 87.90.0.251 port:
27786 pkts: 2 bytes: 0]
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
147.52.3.67 port: 4662 pkts: 2 bytes: 0] [Client IP: 88.35.43.210 port:
4788 pkts: 2 bytes: 0]
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
61.123.32.10 port: 13340 pkts: 1 bytes: 0] [Client IP: 147.52.48.227
port: 1634 pkts: 1 bytes: 0]
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
66.151.150.12 port: 2703 pkts: 4 bytes: 103] [Client IP: 147.52.67.2
port: 47818 pkts: 2 bytes: 17]
[*] Session => Start: 05/25/06-17:23:15 End Time: 05/25/06-17:23:15[Server IP:
147.52.110.2 port: 1433 pkts: 4 bytes: 86] [Client IP: 67.110.178.233
port: 43413 pkts: 5 bytes: 168]
A snorter in #snort told me that there are cases that snort logs 0 bytes
(especially in Web traffic). If this is the case, is there a place that I can
find the heuristics used by snort (or stream4) for that decision?
PS. Please, 'cc' me as I am not subscribed.
Regards,
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