The present invention Network Suraksha Kawach (NSK) maintains the routing information of packets and Ids of source and destination, e.g., IP address, MAC Ids. It works on two ideas, first, identify and block the dead IPs generating heavy traffic. Second, distribute the load so that firewall will not become slow after receiving of heavy requests (may be fake or actual). The invented NSK firewall works in two stages, i.e., NSK1 and NSK2. The NSK1 analyze and filter the packets, after detected abnormality, it handover the packets to NSK2 for further analysis. NSK1 directly sends these packets to destination IP, if there are no abnormalities. NSK1 simultaneously maintain the MAC table including source IP, Source MAC, Destination IP, Destination MAC, Rate of Received Packets (RRP) for Destination IP.