Snort mailing list archives
Re: heavily switched networks
From: Stewart Larsen <slarsen42 () cfl rr com>
Date: Wed, 24 Dec 2003 10:25:51 -0500
Well, you tell me. As a network admin in charge of security, should I be worried about intra-network traffic? Would I be better off running a host-based IDS like tripwire on the servers I care about and only sniffing the uplink? This is all theoretical, BTW. But I'm researching for future opportunities. Stewart On Wed, 2003-12-24 at 10:21, Erek Adams wrote:
On Wed, 24 Dec 2003, Stewart Larsen wrote:right, but where would you tap. Let's assume that I have the gateway and firewall set up going into a 16 port switch. We'll call this switch switch:0. Each port on switch:0 goes to another 16 port switch. We'll call these switch:1 through switch:16. I now have a nicely divided network with 16 segments of 16 computers each. That allows me to have 256 computers on my network. How do I effectively monitor traffic within each segment without a switch that supports SPAN? Do I need to sniff on 256 different wires? or am I missing some fundamental insight here?Perhaps.... Do you care about network <-> network traffic? If not, then just sniff your uplink. Sniff the pipe from the FW to switch:0 and you catch all the traffic coming into your network, no matter how many segments you have. Cheers! ----- Erek Adams "When things get weird, the weird turn pro." H.S. Thompson
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Current thread:
- heavily switched networks Stewart Larsen (Dec 23)
- Re: heavily switched networks twig les (Dec 23)
- Re: heavily switched networks Stewart Larsen (Dec 24)
- Re: heavily switched networks Erek Adams (Dec 24)
- Re: heavily switched networks Stewart Larsen (Dec 24)
- Re: heavily switched networks Erek Adams (Dec 24)
- Re: heavily switched networks twig les (Dec 24)
- Re: heavily switched networks Stewart Larsen (Dec 24)
- Re: heavily switched networks twig les (Dec 23)
- <Possible follow-ups>
- heavily switched networks Russell Fulton (Dec 24)