![]() ![]() ![]() Thus, a firewall acts as a barrier between the internal networks and the outside network such as the Internet. If a firewall receives an ICMP packet, it simply drops the packet and does not allow the packet to enter into the network. Reject: Block the traffic, replying with an “unreachable error”ĭrop: Block/reject the traffic and don’t give any replyįor example, a firewall may have rules configured to allow only HTTP packets. Rules are defined based on the security policy of the organization. A firewall scans all the packets and accordingly accepts, rejects or drops the packet, depending upon the rules configured on it. The main function of the firewall is to screen all the packets entering, leaving and flowing in the network to prevent unauthorized access between two or more computers. A firewall is a network security device placed at the perimeter of the corporate network. ![]()
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