A firewall is an implementation intended to prevent the unauthorized access to or from a private network. Firewalls prevent unauthorized internet users from accessing private networks that are connected to the internet, usually intranets. All messages entering or leaving the intranet (the local network) must pass through a filter called firewall, which inspects every message and blocks those that do not meet the stated security criteria. Some of the limitations of firewall are below:
1. Genuine User Restriction
Even though firewalls are intended to restrict unauthorized data packet transmission to and from the network and can safeguard the system from intrusion, it can create considerable problems for other users. Firewall policies are very restrictive and can limit users from executing legitimate actions. These restrictions can obstruct productivity and even compel users to utilize backdoor exploits to circumvent around them. Using backdoor exploits limits the firewall's ability to secure the network, as data transmitted through these back doors are not filtered or inspected at all.
2. Reduced Performance
Software-based firewalls have the additional troublesomeness of inhibiting the computer's overall performance. Software firewalls are continually running and leech off processor power as well as RAM memory to perform their purpose. This uses resources that could be dedicated to some other tasks. The amount of performance reduction varies on the specs of the network's servers or the individual user’s terminal. Hardware firewalls do not face this problem, as they do not depend on a host computer's resources to perform.
Firewalls have a lot of vulnerabilities....