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FortiBridge operating principles | Normal mode operation |
1Connect the
2Connect the FortiGate external interface to the
3Connect the internal network to the
4Connect the
Connecting the FortiBridge-1000F (fiber gigabit ethernet)
The
1Connect the
2Connect the FortiGate external interface to the
3Connect the internal network to the
4Connect the
Normal mode operation
If the FortiGate unit is operating normally, the FortiBridge unit operates in Normal mode. Traffic from the internal network enters the FortiBridge INT 1 interface then exits the INT 2 interface to the FortiGate unit. The traffic from the FortiBridge INT 2 interface enters the FortiGate internal interface. Firewall policies and protection profiles are applied to the traffic by the FortiGate unit. Accepted traffic then exits the FortiGate External interface and enters the FortiBridge EXT 2 interface. The traffic then exits the FortiBridge EXT 1 interface and goes to the external network. Traffic from the external network reverses this sequence.
Figure 4: Normal mode traffic flow
(Normal mode)
Internal network INT 1
INT 2
Internal
EXT 1 | Internet |
EXT 2 | Router |
External |
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(Transparent mode)
How the FortiBridge unit monitors the FortiGate unit
To monitor the FortiGate unit for failure, you must enable probes on the FortiBridge unit. When you enable a probe, the FortiBridge unit sends packets from the FortiBridge INT 2 interface, through the FortiGate unit to the FortiBridge EXT 2 interface. If the EXT 2 interface receives the probe packets, the FortiGate unit is operating normally. If the EXT 2 interface does not receive probe packets the FortiBridge unit assumes that the FortiGate unit has failed.
FortiBridge Version 3.0 Administration Guide | 11 |