A firewall is used to protect the internal network of your organization from the threats that arises due to the exposure to external network i.e. the internet. A firewall works on a fixed set of rules and examines the packet of data coming in and going out based on the rules defined by you. If an incoming traffic is flagged as against the rules, it is not let through. A firewall is used in numerous ways both in the business environment and for personal use. You can do end number of things using the firewall. Here is a list that demonstrates the use of advanced firewall in business environment and for personal computer use:
How Firewall Protects your Business
- Corporations use highly advanced firewall to protect their extensive network from attackers.
- A firewall can prevent the employees of an organization from sending emails that break the rules of the organization or transmitting sensitive information concerning the business of the organization.
- Firewalls are also use to restrict the access to certain websites, as a company may not want its employees from accessing social media, so in the firewall they define the rule and block such websites.
- A firewall is used to protect the internal network of the organization by restricting an outside computer from accessing the internal network.
How Firewall Helps in Personal Use
- The aim of a firewall for personal use has very specific objective – to protect your computer and data from malicious attackers.
- A firewall helps protect your computer from malwares, viruses, Trojan horse program, and spyware.
- There are two levels at which firewall helps protect your computer – it allows all data to pass except the one that does not meet the predetermined rule or it will restrict all the traffic coming to your system unless it meets the set rule.
There is no limit to what a firewall can do, extensive configurations are managed by highly trained IT professionals.
How Firewall Throughput Is Calculated?
A firewall throughput is the maximum speed at which the firewall can transfer data over the internet. The throughput of a firewall is calculated in a controlled environment; however, you would want your firewall throughput to be double of the internet speed your ISP is providing.
How Firewalls Detect IP Spoofing?
IP network spoofing or IP spoofing is the generation of internet protocol packets with false source IP address. This is done to conceal the identity of the attacker or to give off signature of a trusted machine. A firewall that is devised to drop spoofed packet pings the source IP to check if it belongs to the real hots and if it detects it’s not, then the packet is dropped.
Other method of detecting spoofed packets is through Bogon Filters. A bogon is a false IP address. These are IP addresses that have not been allocated by IANA, by a delegated RIR. It is best to use a firewall that uses supports subscription to the bogon list.
The hops between two hosts remain constant or change only a little. When the TTL changes dramatically from one packet to the other it might be a spoof attempt.
How Firewalls Handle UDP Traffic?
In User Datagram Protocol (UDP), there is no connection formation or termination; it is a direct transmission. Hence, when UDP traffic is sent through the firewall, it adds the entry to the connection table. Since there is no connection termination, the firewall does not know when to remove the entry from the connection table and therefore, relies on idle time, which is by default 2 min.