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SNORT - The Easy Tutorial - Port Mirroring

Snort Port Mirroring
Last Change : Dec 07 2007 french flagenglish flag


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Details What is Snort ?
Screenshots
Prerequisites
Snort
BASE
Update Snort
Bleedingsnort Rules
Port Mirroring




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CONFIGURE YOUR SWITCH

To be sure your IDS analyzes the data you want, you must mirror the traffic of a switch port or VLAN. For this, we will use the "port mirroring" mechanism which means the switch duplicates the traffic on your chosen interface or VLAN and send it to Snort.

Of course, on your IDS system, you need at least one network interface to listen to the traffic, but if you can have two network ports, this will be much more better because you will able to dedicate one of both for the IDS management and the other one will be configured without IP address just to receive the mirrored (or spanned) traffic. In this case, the IDS management data will not "pollute" the mirrored traffic.

port mirroring snort IDS

Here are three "port mirroring" examples with Cisco and Juniper/Netscreen switches:

Cisco Catalyst 6509 or 3750:

Cisco_device#configure terminal
Cisco_device(config)#monitor session 1 source interface GigabitEthernet x/x
Cisco_device(config)#monitor session 1 destination interface GigabitEthernet x/x
Cisco Catalyst 3500XL:

Cisco_device#configure terminal
Cisco_device(config)#interface FastEthernet x/x
Cisco_device(config-if)#port monitor FastEthernet x/x
Juniper/Netscreen FireWall 25

set mirror port source interface1 destination interface2





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