The article consist of study on concept of Network Obstacle (firewall, FW) using PLD-Linux platform and available tools, implementation selected mechanism of security, also analysis the effectiveness of prepared Network Obstacle. Study on concept of Network Obstacle is based on Screened Subnet architecture. Testing effectiveness of network Obstacle was found in two fundamental parts. In the first part was examining the security of network obstacle, testing the resistance attempts of scanning port and the most common attacks. The second part of the research meant to show the influence of the Network Obstacle on time and delay of the realization of transaction for HTTP movement depending on level of the security and movement intensity generated by internal network users. Testing the effectiveness of FW was verify by testing the resistance in an attempt of scanning ports and attacks refusal of service (ICMP, SYN Flood), providing base of dispersed attacks DDoS. This part of the research had one aim, to show the influence FW on time and on delay of the realization the transaction for motion HTTP, depending on the security level and intensity of movement generated by the users of the internal network.
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