Snort mailing list archives
RE: Snort not seeing all traffic?
From: "PJ-ML" <p.jones.ml () xsb com>
Date: Thu, 24 Apr 2003 09:14:53 -0400
The Hub is a Linksys Etherfast 10/100 Hub. All 3 links are operating at 100...that was a great point and I was hoping that would be it. I wanted to point out that Snort does come up with some traffic, just not all...meaning it does not and has not seen attacks/port scans, deliberate or otherwise, on the firewall and the IP addresses it handles. It does see traffic/alerts for a server on the switch below it...Not sure where to go from here...Should I post my snort.eth1.conf file? ~PJ -----Original Message----- From: Matt Kettler [mailto:mkettler () evi-inc com] Sent: Wednesday, April 23, 2003 5:43 PM To: p.jones.ml () xsb com; snort-users () lists sourceforge net Subject: Re: [Snort-users] Snort not seeing all traffic? First question: Is the "hub" a 10/100 dual-speed hub? If so: what speed is the interface from the hub to router? what speed is the interface from the hub to the switch? what speed is the interface from the hub to eth1 on the IDS box? If all three numbers are not the same, that's your problem. The 10/100 "auto switching" hubs are network-wise equivalent to a pair of hubs connected by a 2-port switch (also called an ethernet bridge if you want to get technical about it, and some of these hubs call themselves "auto bridging" instead of "auto switching") 10mbit hub ----- switch ------- 100 mbit hub Thus if there's mismatch in speeds (ie: the snort box is the only 100mbit connection and the other 2 are 10mbit), it won't actually see the traffic because of the internal switch between the two speeds. At 03:17 PM 4/23/2003 -0400, Patrick Jones wrote:
Snort 1.9.1 Red Hat 8.0 2 NICs Eth0 10.x.x.x Eth1 no address Installed ACID Topology: Router - Hub - Switch - Firewall - Internal Network | | | | (Eth1) | IDS(eth0)------------------/
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Current thread:
- Snort not seeing all traffic? Patrick Jones (Apr 23)
- Re: Snort not seeing all traffic? Matt Kettler (Apr 23)
- RE: Snort not seeing all traffic? PJ-ML (Apr 24)
- Re: Snort not seeing all traffic? Erick Mechler (Apr 24)
- Snort is not seeing all traffic... PJ-ML (May 07)
- Re: Snort is not seeing all traffic... Matt Kettler (May 08)
- Re: Snort is not seeing all traffic... PJ-ML (May 08)
- RE: Snort not seeing all traffic? PJ-ML (Apr 24)
- Re: Snort not seeing all traffic? Matt Kettler (Apr 23)
- Re: Snort not seeing all traffic? Erick Mechler (Apr 24)
- Re: Snort not seeing all traffic? PJ (Apr 24)
- Re: Snort not seeing all traffic? Erick Mechler (Apr 24)
- <Possible follow-ups>
- Re: Snort not seeing all traffic? PJ (Apr 24)