Snort Topology Configuration

[DThomaz () flowserve com]

I have setup snort on my local LAN. The snort box is collecting only from
my LAN.
I want to sniff all packages that came from my WAN in to the LAN using
snort.
My question is that if I span the Ethernet port of my WAN router to the
sniffer port should collect all  WAN data coming in the LAN?
Here is my network:

     ethernetport<router>WAN--------------CLOUD
            |
            |
     switch CAT4k
            |
            |
     Snort box

Do I need any special configuration on the snort box to use the span
command from the switch?

Thanks for the support,

dthomaz





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