Firewalls are used to separate your internal networks from the Internet and to limit access from outside the network to your internal resources. Untangle's Firewall application is a layer 7 firewall, which means it can block traffic based on the protocol, IP, port, and even the Active Directory users and groups.
Untangle's Firewall application works in OSI layer 7 (application layer), which allows it to completely understand the traffic and hence filter that traffic based on various application layer conditions such as Client has Exceeded Quota and HTTP: Client User OS.
Untangle's Firewall application rules define the criteria of the traffic. When this criteria is matched with the rule, the action described on that rule will be taken. The different criteria (matchers) are as follows:
Source IP address
Source port
Source interface
Destination IP address
Destination port
Destination interface
Protocol
Active Directory user
Active Directory...