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Firewall Configuring virtual IPs
FortiGate-100A Administration Guide 01-28007-0068-20041203 217
4 Select the virtual IP External Interface from the list.
The external interface is connected to the source network and receives the packets to
be forwarded to the destination network. You can select any firewall interface or a
VLAN subinterface. You can set the virtual IP external interface to any FortiGate
interface. Table 22 on page 217 contains example virtual IP external interface settings
and describes the policies to which you can add the resulting virtual IP.
5 Select Static NAT.
6 Enter the External IP Address that you want to map to an address on the destination
network.
For example, if the virtual IP provides access from the Internet to a web server on a
destination network, the external IP address must be a static IP address obtained
from your ISP for your web server. This address must be a unique address that is not
used by another host and cannot be the same as the IP address of the external
interface selected in step 4. However, the external IP address must be routed to the
selected interface. The virtual IP address and the external IP address can be on
different subnets.
7 Enter the Map to IP address to which to map the external IP address. For example,
the IP address of a web server on an internal network.
8 Select OK.
You can now add the virtual IP to firewall policies.
To add port forwarding virtual IPs
1 Go to Firewall > Virtual IP.
2 Select Create New.
3 Enter a name for the port forwarding virtual IP.
4 Select the virtual IP External Interface from the list.
The external interface is connected to the source network and receives the packets to
be forwarded to the destination network.
You can select any firewall interface or a VLAN subinterface.
5 Select Port Forwarding.
Note: The firewall translates the source address of outbound packets from the host with the
Map to IP address to the virtual IP External IP Address, instead of the firewall external address.
Table 22: Virtual IP external interface examples
External Interface Description
internal To map an internal address to a wan1, wan2, DMZ1, or DMZ2 address. If
you select internal, the static NAT virtual IP can be added to
Internal->WAN1, Internal->WAN2, Internal->DMZ, and
Internal->DMZ2 policies.
wan1 To map an Internet address to an internal, DMZ1, or DMZ2 address. If
you select wan1, the static NAT virtual IP can be added to
WAN1->Internal, WAN1->DMZ1, WAN1-> DMZ2, and WAN1->WAN2
policies.