![]() ![]() If this is not carefully planned it can result in poor/non-optimal performance (for traffic over the tunnel) in the end. So the solution is to cheat Forti and set ip address of loopback interface as the same as ip of external interface in the IPSEC tunnel. In the end tunnel can be set up but Forti will reject ESP packets as it comes from unknown source. The use of this loopback interface requires that Router2 also includes the neighbor update-source router configuration command in its own configuration. Something is wrong with recognition loopback interface as end of SNAT in IPSEC tunnel. Please refer to this link regarding NPU loopback offload support: Routerl will specify the address of the loopback interface (201.13.145.88) of Router2 in the neighbor remote-as configuration command. This configuration example shows the loopback interface configured on the Fast. It is necessary to know whether the FortiOS version running on the unit supports NPU offload on the loopback interface or not. My Scenario is following: I have a Fortigate firewall that I am trying to. For devices with NP7, running on FortiOS 7.0.6 and 7.2.1 and above, hardware acceleration is supported on Loopback interfaces. The outbound IKE traffic does not require a firewall policy.Īlso, starting from FOS 6.2.8, 6.4.9, and 7.0 upward, it is possible to enable asymmetric routing on the loopback interface. It is recommended to configure IPSec on npu-vlink in case of multi-VDOM or use a Physical interface. The best practice when IPSec is bound to loopback is to configure inbound Firewall policy from the WAN interface to the loopback interface and permit service=IKE. To this end Ive tried setting up a loopback interface in this subnet but still cant get the NAT to work. Im thinking that as the firewall doesnt actually have an interface in the 172.16.0.0/28 subnet that this is the issue. Now the inbound IKE traffics are destined for the local-gw IP, however, the traffic did not come into the FortiGate through the loopback interface, but through our WAN, e.g. I want to set up a NAT to point 172.16.0.2 to my internal server 192.168.2.73, but I just cant get this to work. If this local-gw is to be configured manually, it must be a primary or secondary IP on the referenced interface that was explained earlier. ![]() If this IP is not expressly configured with ' set local-gw x.x.x.x', then the primary IP of the interface stated or referenced under 'IPSec phase-1 interface' configuration is used as local-gw IP. ![]() Whenever there is 'inbound' IKE traffic to FortiGate, the destination of such traffic is the local-gw IP. In the above configuration sample, the remote gateway (remote-gw) was stated, but the local gateway (local-gw) was not and it’s usually not mandated/enforced since FortiGate has a way of retrieving it (unlike remote-gw which is impossible for FortiGate to guess). Sample configuration: IPSec VPN phase 1 bounded to the loopback interface. This article describes how to configure FortiGate with IPSec VPN implanted on or bounded to the loopback interface. ![]()
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