NAT

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NAT (Network Address Translation) means the manipulation of target or destination IP addresses or ports. There are many reasons for manipulating packages. Often there are not enough public IP addresses that you get from the provider. Or there is a transparent proxy running, which catches the IP-connection and directs it to a local port.

 

GibADMIN offers a module for NAT. There you have to set, which packets should be manipulated. For that you have to select the interface and the direction of the packet in a select box. Gibraltar creates an outgoing- and an incoming track for every network interface. Depending on the selection, only packets for the respectively direction on the chosen network interface are handled. Therefrom you get the possibilities how to handle the packet.

 

The name track means a way, the packet can go. There are incoming and outgoing tracks, depending on, if the packet comes into the firewall over an interface or if the packet leaves the firewall.

 

TIP: In the NAT module you can use the same aliases for hosts, nets and ports, that were defined by you in the firewall module.