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FortiBridge operating principles Example FortiBridge application
FortiBridge Version 3.0 Administration Guide
09-30000-0163-20061109 9
FortiBridge operating principles
This chapter describes a typical transparent mode FortiGate network and how to
add a FortiBridge unit to this network to provide fail open protection. This chapter
also contains detailed information about how FortiBridge units operate and
concludes with descriptions of adding a FortiBridge unit to an HA cluster and
connecting a FortiBridge unit other FortiGate interfaces.
This chapter contains the following sections:
• Example FortiBridge application
• Normal mode operation
• Bypass mode operation
• FortiBridge power failure
• Example FortiGate HA cluster FortiBridge application
• Example configuration with other FortiGate interfaces
Example FortiBridge application
A typical application of a FortiGate unit operating in transparent mode is to insert
the FortiGate unit into an internal network, between the network and the router
that connects the network to the Internet. In this configuration, the FortiGate unit
can provide security services for all traffic passing between the internal network
and the internet. These security services can include:
• applying firewall policies and IPS attack prevention to all traffic,
• applying virus scanning to HTTP, FTP, POP3, SMTP, and IMAP traffic,
• applying web filtering to HTTP traffic,
• applying Spam filtering to POP3, SMTP, and IMAP traffic.
The internal network is connected to the FortiGate unit internal interface. The
router is connected to the FortiGate unit external interface. The FortiGate unit can
be added to the network without changing the configuration of the network (except
to add the FortiGate management IP address).
Figure 2: Example transparent mode network
To allow users on the internal network to connect to resources on the Internet, add
Internal -> External firewall policies to the FortiGate unit. Add protection profiles
to the firewall policies to apply security services such as virus scanning, web
filtering, spam filtering and IPS to the traffic that passes through the FortiGate unit.
Router
Internal External
(Transparent mode)
Internal network
Internet