Snort mailing list archives
Re: multiple interfaces on a Snort sensor
From: Edin Dizdarevic <edin.dizdarevic () interActive-Systems de>
Date: Tue, 27 May 2003 17:28:54 +0200
francesco wrote:
In the near past (March 11-13) there were a couple of threads about the [...]
The dual interface is supported (though not recommended, I understand, by some people who replied to the original message) by inserting the option: -i any on the command line. This configuration works also if you have a stealth mode interface, i.e. , you do not get error messages when you run the process but it seems that the logs and the alert are not from the two interfaces but only from the interface having the IP address. I tried this with version 1.9.1, so I cannot confirm whether version 2.0.x has a different behavior. I wish to read some comments from those who also experimented such configuration, that in my humble opinion could work fine (no significant packet loss) with some good quality ethernet cards and a fast (current) PC.
Of course it will work. Please read the libpcap docs about this case. Also the tcpdump-workers list is a good source. AFAIK if you specify "any" on the command line (either snort or tcpdump or whatever) all packets from all interfaces (including loopback!) will be copied to the application listening. This behaviour has nothing to do with Snort, but with kernel sockets. Remember that in this case, the promisc mode will not work too, since the socket is ignoring the "set promisc mode" flag. Again: See the libpcap docs, especially those from Phill Wood... Regards, Edin -- Edin Dizdarevic ------------------------------------------------------- This SF.net email is sponsored by: ObjectStore. If flattening out C++ or Java code to make your application fit in a relational database is painful, don't do it! Check out ObjectStore. Now part of Progress Software. http://www.objectstore.net/sourceforge _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- multiple interfaces on a Snort sensor francesco (May 27)
- Re: multiple interfaces on a Snort sensor Edin Dizdarevic (May 27)