My WAN interface is peering with the ISP with a /30 subnet. If this is not carefully planned it can result in poor/suboptimal performance (for traffic over the tunnel). Hello Emnoc, i am using ip pool for the nat (but i set the loopback IP as my pool) and my policy for internal traffic src interface (lan) dst interface (WAN) with nat enable is also using the address listed in the ip pool. Refer to this article regarding NPU loopback offload support. It is necessary to know whether the FortiOS version running on the unit supports NPU offload on the loopback interface or not. To control traffic ingressing to the FortiGate from allowed source IPs to establish an IPsec tunnel on the loopback interface, phase 1 must be configured to respond only.Īlso, starting from FortiOS 6.2.8, 6.4.9, and 7.0 upward, it is possible to enable asymmetric routing on the loopback interface. Since traffic initiated from a loopback interface is considered as local-out traffic, there is no option to control local-out traffic by creating a policy. As a result, no policy is required to pass IKE traffic. If the FortiGate is configured as the initiator in phase 1, it will ignore the policy with the source address configured because the loopback interface will create a session from the FortiGate, and return traffic will match the session. The outbound IKE traffic does not require a firewall policy. 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. 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. 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. To enable sending FortiAnalyzer local logs to syslog server: Go to System Settings. Whenever there is 'inbound' IKE traffic to FortiGate, the destination of such traffic is the local-gw IP. Nat Port Forwarding) using ip loopback on fortigate. 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. If you don’t want to change your global NAT policy create an address object for the internal IP and use that instead.This article describes how to configure FortiGate with IPSec VPN implanted on or bound to the loopback interface. Log in to the GUI and go to Policy & Objects > Objects > Virtual IPs > Create new, set the following parameters: Name: Give any friendly name, for example: Virtual IP. I can’t see Virtual IP in the Policy: Then it’s either bound to an interface that ISN’T the inside one, or you have Central NAT enabled. This article explains how to access the natted server internally with the Public IP/Virtual IP. Policy and Object > Firewall Policy > Create New > Give the Policy a Name > Set the incoming and outgoing interface to the internal one > Source = All > Destination > the Virtual IP you just Created > Schedule = always > Service = HTTP > Disable NAT > OK. If you can’t edit it (because it’s in use), then you might need to remove it from the existing policy, and recreate it. I already Have a Virtual IP: If your existing web server already has a Virtual IP object MAKE SURE it’s NOT bound to the outside interface, (or you won’t be able to select it in a minute). Polices and Objects > Virtual IPs > New > Virtual IP > Give it a Name > Interface = any > Set External IP > Set Internal IP > Note: You don’t have to set port forwarding but I’m only using TCP 80 > OK. it being broken on my LAN PC, I cannot browse to that site, and you can see my DNS is resolving to its public IP. If you have internal DNS servers you can of course solve this problem with Split DNS with a Cisco firewall, you could also solve this problem with DNS Doctoring, In fact if your from a Cisco background then even the name Hairpin is confusing because in Cisco when we mention Cisco Hair pinning we are usually talking about VPN traffic.
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