Audit Vault and DB Firewall Design

Question

I have and application (JAVA Based) connected to the database 11g using JDBC,
I am going to implement Audit Vault and DB firewall R12 for three reasons:
1. monitoring the traffic
2. blocking un wanted SQL statements.
3. blocking un wanted IPs/Users
Our two Physcial servers that will be used for Audit Vault and DB Firewalls contain two NIC each.
My Questions:
1.  How to put these two servers in our network to be able to mointor as well block traffic, we don't need to change anything to our exisiting network configuration.
2.  How to DB Firewall will block unwanted incomming traffic from the JAVA application to our database.
please any usefull documents, links, ideas, network design
I tried official Oracle Document, it is useless

Answer 1

hi,
1. if you plan to block sql using the firewall you will need 3 NICs in the firewall appliance since apart from the management interface you will need to setup a bridge (with 2 NICs) to physically route the traffic through the firewall, this also requires you to patch the appliance properly inside your datacenter between the protected database and the client or middle tier servers, so you can't do  this w/o changing anything in your nw configuration.
2. you will need to compile a whitelist based on what your trusted applications are doing normally, this is an iterative process, then the firewall will be able to block sql not in the whitelist (replace it with something like select 1 from dual), since the only physical network path from the java clients to  the secured target db goes via the bridge
Comment: so if you have a chance: pull one NIC out of the AV server (it only needs 1) and plug it into the firewall appliance.
greetings,
Harm ten Napel