Concept: The header of the packet ip ip ip address into another protocol address. When IP data packets through a router or device, the source IP address of the router or device IP packets will be converted and / or destination IP address.
There are two types of NAT rules:
Respectively, NAT and port mapping rules.
NAT translates the source IP address, thus hiding internal IP address or IP addresses to share limited;
Port mapping converts the destination IP address, the device is usually protected by the internal server (e.g., WWW server or SMTP server
service device) an IP address into a public IP address.
Try to make a simple intranet and extranet NAT translation.
1, to configure the interface IP Address: Set network and external networks.
2, disposed substantially NAT translation.
3, the route setting, route configuration purposes.
4, configure security policy.
5, you can create a new local authentication, user authentication to the Internet by the way.
6, the newly created user can get online certification
