Linux Firewall

Understanding FirewallA firewall is a system or device that allows network traffic to be safe and prevent traffic through an insecure network. Generally, a firewall is implemented in a dedicated machine, running on the gateway (gateway) between the local network and other networks. Firewalls are generally also used to control access to anyone who has access to a private network from outsiders. Currently, the term firewall becomes a generic term that refers to a system that manages the communication between two different networks. Given that many companies currently have access to the Internet and corporate networks is also of course in it, then the protection of the company's digital assets from attack by hackers, perpetrators of espionage, theft or other data, becomes essential. "So the firewall is a mechanism to protect the security of computer networks by filtering data packets in and out on the network. Data packets are "good" is allowed to pass through the network and Dapa package is considered "evil" are not allowed to pass through the network. Firewalls can be either software or hardware embedded software can menfilter data packets. Firewalls can also be an attitude that is planted and taught to a company's IT staff not to divulge the company's corporate data. This is to prevent one type of hacking is social enggeneering.Or provide a safety lock on the computer equipment and networks, for example, enter the server into a special room and locked. Room keys are only held by the IT staff and are allowed to use that space with the permission of the IT staff. It serves in addition to keeping the loss of computer equipment and network physically by a thief or robbery, but also serve to keep the loss of data stored on the computer equipment. It could be someone stealing and deleting important data of the company. Obviously this is very detrimental to the company.