snort act as IPS

[amin Salehi <seyedamin_salehi () yahoo com>]

hi.
1-for snort to act as IPS whether the IPS host(host that snort install on it) must be a hop en route(act as a router) 
or can be a bridge or both?
2-when snort act as IPS that act as router(decrease TTL) when i use afpacket whether ipv4 forwarding must be enabled or 
afpacket do the forwarding job itself?
3-what is the relationship between snort act as IPS and iptables?whether snort instruct iptables to block traffic or 
snort do the blocking job itself?
4-whether promisc mode on 2 interface of IPS must be enabled?

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