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New Member

4230 on outside of PIX

When I look at my IDS logs in IEV, all of my out/in traffic uses my NAT adddress as the local address. Is there a way to configure it differently so I can see the actual internal IP? Because it doesn't do me much good to see that my NAT'd address was a victim of the BLASTER worm.

Cisco Employee

Re: 4230 on outside of PIX

The sensor reports the IP in the packets that it saw.

So this is a result of where you have the sensor deployed.

It sounds like your sensor is monitoring on internet side of your fireall so it is seeing packets with the NAT address. So the alarms will all report the NAT address. The sensor nor IEV will do any reverse translation to figure out the actual address because this would require constant polling of the firewall for it's translation tables.

If you move the sniffing interface of your sensor to the Inside of your firewall then the packets will have the actual internal ip addresses and not the NAT address.