configuring snort 2.9.1 as IPS?

[jorbru30 () comcast net]

Hi, 


I need help in running snort as an IPS. I am running snort version 2.9.1 using the following command. 



     snort --daq afpacket -i eth0:eth1 -Q --daq-dir=/usr/local/lib/daq -l /var/log/snort -c 
/usr/local/snort/etc/snort.conf 


I expected snort to process packets transmitted from eth0  to eth1 and  packets transmitted from  eth1 to eth0 but 
instead I see snort processing double the number of these packets . It seems to me it is processing every packet  
captured from eth0 and eth1 . 



Please help me if there is any problem with my command/configuration . 



I appreciate any help! 





Thank you. 



Jorda.

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