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The firewall implements packet filtering and thereby provides security functions, that are used to manage data flow to, from and through the router. Along with the Network Address Translation it serves for preventing unauthorized access to directly attached networks and the router itself as well as a filter for outgoing traffic. With our  firewall, which means that it performs full packet inspection and keeps track of the state of network connections traveling across it. 

It also supports Source and Destination NAT (Network Address Translation), NAT helpers for popular applications and UPnP. The Firewall provides features to make use of internal connection, routing and packet marks. 

It can filter by IP address, address range, port, port range, IP protocol, DSCP and other parameters, also supports Static and Dynamic Address Lists, and can match packets by pattern in their content, specified in Regular Expressions, called Layer7 matching. Our firewall facility also supports IPv6.