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> Chapter 15 - High Availability > FortiGate Session Life Support Protocol (FGSP) > Synchronizing NAT sessions

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Synchronizing NAT sessions

By default, NAT session are not synchronized. However, the FGSP can synchronize NAT session if you enter the following :

config system ha

set session-pickup enable

set session-pickup-nat enable

end

However, if you want NAT sessions to resume after a failover you should not configure NAT to use the destination interface IP address since the FGSP FortiGates have different IP addresses. With this configuration, after a failover all sessions that include the IP addresses of interfaces on the failed FortiGate will have nowhere to go since the IP addresses of the failed FortiGate will no longer be on the network.

Instead, in an FGSP configuration, if you want NAT sessions to failover you should use IP pools with the type set to overload (which is the default IP pool type). For example:

config firewall ippool

edit FGSP-pool

set type overload

set startip 172.20.120.10

set endip 172.20.120.20

end

Then when you configure NAT firewall policies, turn on NAT and select to use dynamic IP pool and select the IP Pool that you added. Configuration synchronization should add the same IP pools and firewall policies to all FortiGates in the cluster. If configuration synchronization is not enabled you must add the same IP pools and policies to all of the FortiGates in the cluster.