In the last few years, the intranet and Internet has experienced explosive growth due to number of benefits. Internet is insecure which makes security of private networks system an imported limitation. Firewall is installed as the first step of securing private networks. Firewalls are implemented at the block point of private network to protect them from external attacks through restricted defined rules and policies reaching network interface. Regular complaints have been raised due to invasion, intrusions and attacks of private networks even with the presence of firewalls. For purpose of confirmation, real time framework needs to be implemented to observe, examine effectiveness and functionality of firewalls by installing Network Intrusion Detection Systems (NIDS) security software within network perimeter to examine firewall operation. NIDS detects, offensive, inaccurate, or irregular action on a network and they are proper for any types of institute for defending the networks and systems. By setting up framework according to defined rules and policies deviation are reported automatically where administrator can check the events examined or audit to check if the firewall complies according to configured rules or policies where some are complex and high-level to implement all rules setup. The reported events enable the administrator to enforce and implement the appropriate rule which make the network safer to use.