Fortinet FortiGate-800 manual Restricting access to a single Internet connection

NAT/Route mode installation Configuration example: Multiple connections to the Internet

Restricting access to a single Internet connection

In some cases you might want to limit some traffic to being able to use only one Internet connection. For example, in the topology shown in Figure 9 on page 51 the organization might want its mail server to be able to connect to only the SMTP mail server of ISP1. To do this, you add a single Internal->External firewall policy for SMTP connections. Because redundant policies have not been added, SMTP traffic from the Internet network is always connected to ISP1. If the connection to ISP1 fails the SMTP connection is not available.

FortiGate-800 Installation and Configuration Guide 57