Snort mailing list archives
Re: Promiscuous mode (again)
From: Erek Adams <erek () theadamsfamily net>
Date: Tue, 18 Sep 2001 09:00:14 -0700 (PDT)
On Tue, 18 Sep 2001, snortlst snortlst wrote: [...snip...]
So according to that it is mandatory to have NIC in promiscuous mode on snort machine.....one of the guys send me an answer that it is not mandatory..... Can anybody clarify this issue?
No, it's not mandatory. It's just more useful.
(On the other hand - what's the use of having promiscuous mode if we use swithches on the network?)
Here's the basic difference between promisc and non-promisc: Promiscuous mode will see 'all' packets on the local wire. Non-Promiscuous will only see packets directed _AT THAT BOX_. Now to define ''all packets'--If it's on a switch, you'll need to be port mirroring or spanning to see all traffic on the switch. If you're on a 'True Hub', you'll see all traffic without any effort. Traffic that is directed 'at that box' means broadcast traffic and traffic that has a dest. address of the box in question. As for the use of promisc on a switched net, well... Only useful if your switch will allow you to span/mirror or has a special monitor port on it. Does that help, or does it make it even less clear? I hope it helps! :) ----- Erek Adams Nifty-Type-Guy TheAdamsFamily.Net _______________________________________________ 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:
- Promiscuous mode (again) snortlst snortlst (Sep 18)
- Re: Promiscuous mode (again) Erek Adams (Sep 18)