Snort mailing list archives
Re: inbound alerts only
From: "Stephen Dunn" <sdunn () stephendunn com>
Date: Thu, 26 Jun 2003 19:35:42 -0700 (PDT)
Check the port mirroring configuration on your switch. Many switches will give you the option to monitor just the tx or rx portion of a mirrored port. If you use tcpdump, confirm that you can see both directions of an established connection: tcpdump -i <your interface> -n host xxx.xxx.xxx.xxx and port 22 If you do not see any output indicating your internal host as the source, this is most likely your problem. Steve
Hello everybody,I am having a sorta weird problemo. I looked through the FAQ and did a web search etc. but didn't find any solution to my problem. (or maybe didn't look effectively enough) I have snort running on a solaris box right outside a firewall with a stealth interface. I added this rule: 'alert tcp any any -> xxx.xxx.xxx.xxx 22' and tried to ssh to the x'd out IP from an internal machine; No alerts were triggered. Upon noting that such a simple rule wasn't working, I looked through all my previous alerts and noticed that not a single alert was from one of our internal machines going outbound ( I would at least expect a false positive or two here and there since we use 'any' as our $HOME_NET and $EXTERNAL_NET). All alerts were from external machines coming into our network. Has anyone seen anything like this before? Is there a setting somewhere which states only look for inbound bad traffic? Could our firewall be somehow mangling the traffic enough that it doesn't quite match a rule somehow; e.g NAT or something? I have tried several different tests to try to figure out what is going on but to no avail.. Any thoughts? I am missing something really obvious?Thanks Everyone! Dave _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web!
------------------------------------------------------- This SF.Net email is sponsored by: INetU Attention Web Developers & Consultants: Become An INetU Hosting Partner. Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php _______________________________________________ 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:
- inbound alerts only David (Jun 26)
- Re: inbound alerts only Stephen Dunn (Jun 26)