An overview of the Linux firewall
In a typical business setting, especially in larger enterprises, you may encounter various types of firewalls in various places that can provide various types of functionality. Here are some examples:
- Edge devices that separate the Internet from an internal network translate routable public IP addresses to non-routable private IP addresses. They can also provide various types of access control to keep out unauthorized people. By also providing various types of packet inspection services, they can help prevent attacks on the internal network, keep out malware, and prevent the leakage of sensitive information from the internal network to the Internet.
- Large enterprise networks are normally divided into subnetworks, or subnets, with each corporate department having a subnet to call its own. Best practice dictates separating the subnets with firewalls. This helps ensure that only authorized personnel can access any given subnet. ...
