Snort mailing list archives
Re: Newbie question - I did read the FAQ first.
From: stephane nasdrovisky <stephane.nasdrovisky () paradigmo com>
Date: Tue, 24 Aug 2004 08:32:36 +0200
Mike Lieberman wrote:
If it's your 1st snort implementation, keep it simple, setup complex sensors when you are 'fluent' in snort, acid, ...Sorry about this use of bandwidth, but we are planning out our first implementation of SNORT
These taps make sure the sensor do not send information over the network, you may consider it is a kind of security measure. Sending and receiving packets do not need a tap, you need a network connection (and a little configuration of your switch if you have one and want to be able to monitor traffic not targuetting your sensor. this feature is sometimes called port mirroring or port monitoring)and after reading some of the DOCs and reviewing the FAQ we have a TAP hardware question. In Brian Laing's excellent "How To Guide: Intrusion Detection Systems" he states that "Without extra modifications the solution cannot monitor traffic in both directions" [page 11] and "Terminate Sessions: Since Taps only allow traffic to flow in one direction the IDS cannot terminate sessions" [page 17]
Yes, the sensor will receive the whole traffic, which is fine. If you want to send packets over the network (for an acid db or for killing tcp sessions), you need a device with such capabilities (a switch, for example),or you'll need a 3rd nic for sending packets (this later one have to be plugged into your network, not a one direction tap).I have been looking at two Active Taps (such as the NCT1C) in which the manufacturers indicate that both directions are sent to the IDS system. Is this type of Tap compatible with SNORT?
Basically, terminating a session requires snort to send packets, the tab you describe only alows your sensor to receive packet, make your own conclusion on your needs..If yes, is the information on "Terminate Sessions" on page 17 still accurate with the need for two Taps and a Top Layer Switch or can it be done with this type of single Active Tap?
I guess it's more expensive than adding a second NIC in your sensor(there is an existing linux driver allowing you to combine the 2 incoming streams into a virtual NIC, which seems about the same as the datacom solution) The solution looks nice (although additional hardware=,in my mind, additional failures), but I would probably opt for a more simple linux/bsd solution with a lot of NICs (there are some quad ethernets, just in case). If your budget is limited, you could even use the same box fox firewalling, IDS, proxy, mail gateway(with av),.... In order to keep it simple, begins to setup your new box as a stupid router, add features when you're confident with your previous setup, try not to be too fast. If you need 1 year to get the box configured as you want, it's better than nothing.Also, there is a Datacom Systems' SINGLEstream which has Two Taps, both of which "combine the two data streams, allowing any connected 10/100 monitoring device to receive a full-duplex stream of data with one NIC."Could this be used for bi-directional Kills?
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Current thread:
- Updated to Snort 2.2.0 and now nothing is being written to Acid b7time b7time (Aug 23)
- Re: Updated to Snort 2.2.0 and now nothing is being written to Acid Paul Dokas (Aug 23)
- Newbie question - I did read the FAQ first. Mike Lieberman (Aug 23)
- Re: Newbie question - I did read the FAQ first. stephane nasdrovisky (Aug 23)
- Newbie question - I did read the FAQ first. Mike Lieberman (Aug 23)
- <Possible follow-ups>
- Re: Updated to Snort 2.2.0 and now nothing is being written to Acid b7time b7time (Aug 27)
- Re: Updated to Snort 2.2.0 and now nothing is being written to Acid Paul Dokas (Aug 23)