[Snort-users] SNORT sensor on FreeBSD Bridged IPFW Firewall!

["Athena" <mailinglists@presstekeurope.com>]

Hi Group

 

I have just finished setting up snort console box with two snort sensors running on FreeBSD and all seems to be working perfectly!

 

However I would be grateful if somebody would be able to help me with one question:

 

Firstly here is a quick rundown of my LAN.

 

I have a FreeBSD-6.0 bridged firewall with three interfaces. The first two are configured in a bridge (passed through IPFW) with no IP addresses and the third is a management interface with one public IP Assigned.

 

One side of the bridge connects into a DSL router and the other side & management interface connect into a HUB (Not Switch) where various other FreeBSD systems with public IPs sit:

 

1]    POSTFIX SMTP

2]    PRIMARY DNS

3]    SNORT CONSOLE

4]    NATD SERVER

 

I currently have a two sensors running on both sides of the NATD Server which logs traffic both on my private LAN and firewalled public side; this works perfectly, however its only providing me information on my trusted network and I still have no idea what's happening on the untrusted side.

 

So this leads me onto my question:

 

Is it possible to install a SNORT sensor on the internet facing interface of my FreeBSD Bridge and if I did would it capture packets before they are passed through IPFW? Or, as I suspect would it be better if I install a TAP between my router and the internet facing interface?

 

Hope somebody can help & many thanks in advance.

 

Regards

Athena

 

 

 

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