![]() In order to propose a solution, there must first be a problem. Enter a name for the VIP in the name box.Įnter the External IP Address/Range and the Mapped IP Address/Range.Įnable Port Forwarding and specify the External Service Port and the Map to Port. Go to Policy & Objects > Virtual IPs > Create New > Virtual IP. Create a VIPīefore creating a policy for the hair-pinning, e nsure that there is a policy managing traffic from the external to internal through the VIP. Here is what you need to do to configure hair-pinning on your FortiGate: 1. As a test, the packets will try and connect to the server from an IP on the same subnet, 172.20.121.41.To avoid confusion, the IT department has been asked to make sure the same bookmark works whether the user’s computer is connected to the internal LAN or anywhere on the Internet. ![]() Seeing as words are easier to remember than numbers, most people bookmark this connection rather than try to remember it.The server listens for SSH traffic on port 22 but because there are multiple servers using SSH and only a few external IP address port forwarding will be set up from port 12345. SSH is running on the server and it will be used for testing purposes.The Fully Qualified Domain Name for the website is, which resolves to 172.20.121.41.A company has a server on its internal LAN at IP address 192.168.1.98/24.The following hair-pinning scenario uses the situation where the VIP is associated to “any” interface. The VIP will take traffic sent to a public IP address and forward it to an internal IP address, such as the server’s private IP. A VIP, also known as port forwarding, is set up to allow external users to access an internal server. It is then forwarded by the FortiGate through a virtual IP to the intended destination.Īs a convenience, if a VIP is being used simultaneously with hair-pinning, the same address can be used whether you are on the inside or the outside of the firewall. The packet then “hair-pins” back on the same interface, connecting to its external IP. The way it works, is that a packet travel through an internal interface and out towards the Internet. Now any traffic going to WAN through this policy will be NAT’d through the IP Pool address(es) you specified, thus, the outbound traffic from your SMTP server will originate from the same address as the R-DNS lookup for you domain’s A-Record and result in successful mail delivery.Hair-pinning, also known as NAT loopback, is the technique where a machine accesses another machine on the LAN via an external network. Specify the pool name you created before.Next we need to go to Policies in the Policy & Objects -> Policy -> IPv4 section and select the policy from LAN -> WAN that contains our SMTP server and edit the Firewall/Network Options section: Set the External IP Range to be a single address in the block assigned by your ISP.Set the type to Overload (To allow multiple back-end devices to use this one public IP).So we need to first create an IP Pool in Policy & Objects -> Objects -> IP Pools: These assigned addresses will be used instead of the IP address assigned to that FortiGate interface. An IP pool defines a single IP address or a range of IP addresses to be used as the source address for the duration of the session. IP Pools are a mechanism that allow sessions leaving the FortiGate Firewall to use NAT. How do I get traffic from a specific policy to originate from a static public IP of my choosing?įortigates have a concept called IP Pools ↗. It is not immediately obvious on Fortigates how to do this, typically, when you create a policy and NAT traffic out through it, the Fortigate will use its’ own public IP assigned by the ISP to originate the traffic from, if you have got a static IP and use an unnumbered address from your ISP then you might be lucky and your R-DNS might match this, however, in most cases you will have a separate Virtual IP for your SMTP server that is different to this and thus you need the R-DNS lookup to match that of the A-Record. Sometimes you need your devices (say an SMTP server) to have a specific outbound public IP for things like reverse-DNS look-ups to ensure mail delivery and reputation, or maybe you want traffic from particular devices or policies to go out an IP for means of tracking.
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