Example Config Network (For Web Server and Application Server)

From picture, It has two zone (Web Zone and Application Zone)
1. Web Server, It has IP in Lan --> 10.221.7.120 but it access from outside IP 172.20.3.1 (Internet IP) . Sometimes, it will be other system protect (ex. firewall) . The other side which it will access Application Server, it has IP 192.168.0.50(Intranet IP).
2. In case Websphere, It will not load balance between Web Server and Application Server because Websphere can operate load balance itself.

How do you check firewall for allow application server or web server

1. Check IP, It can access from internet, intranet or network
- In Network, It can not access from internet to this network. It can access in this network only. (ex. 10.1.1.1)
- In Intranet, It is IP of organization. It use to access in organization.
- In Internet, It can access everywhere.
2. In case Application Server and Web Server, it following
- If your server access outside, you must allow firewall --> Application Server Side.
- If everyone must access your server, You must allow firewall --> Web Server Side.
3. In case Cluster, You must allow firewall --> All server in Cluster.
4. In case Load Balance, You must allow firewall --> at load balance.