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Network security – firewalls and PAM
Firewalls
Computer firewalls are used to serve the same purpose as the physical firewalls, i.e. to keep fire from spreading. Here the fire is unwanted and unauthorized attackers. In networking world a firewall is also called as Packet filter. Firewall can either be a physical piece of hardware or it can be software that sits between our network and internet. It controls and regulates the flow of information.
Linux system acts as a filtering firewall. A filtering firewall filters traffic flowing between our network and the internet. It can limit the type of communication. It can also limit the access to or from the internet to specific computers on our network.
For Linux to work as filtering firewall, we either can use iptables or ipchains. The iptables is newer than ipchains, and is used as default firewall now a day. We can set different levels of firewalls for different systems on the network.
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