Ipsec fortigate pdf

Click Add and then click See all. In the Everything pane, search for Local network gateway and then click Create local network gateway. Set the remaining values for your local network gateway and click Create. Enter a Name for the tunnel, click Custom , and then click Next. Configure the Network settings. For Interface , select wan1. In the Authentication section, select Configure the Authentication settings.

For IKE , select 2. Configure the Phase 1 Proposal settings. Set the Encryption and Authentication combination to the three supported encryption algorithm combinations accepted by Azure. Set Key Lifetime seconds to Set the Encryption and Authentication combinations. Click OK. Create a firewall object for the Azure VPN tunnel.

Create a policy for the site-to-site connection that allows outgoing traffic. Set the Source address and Destination address using the firewall objects you just created. Disable NAT. Create another policy that allows incoming traffic. For this policy, reverse the Source address and Destination address. We recommend limiting the TCP maximum segment size MSS being sent and received so as to avoid packet drops and fragmentation.

To do this, use the following CLI commands on both policies. Create an IPv4 Static Route that forces outgoing traffic going to Azure to go through the route-based tunnel.

Set the Administrative Distance to a value lower than the existing default route value. Description This article discusses about the nattraversal options available under the phase1 settings of an IPsec tunnel. As a result, the packets cannot be de multiplexed. When the Nat-traversal option is enabled, outbound encrypted packets are wrapped inside a UDP IP header that contains a port number. This extra encapsulation allows NAT units to change the port number without modifying the IPsec packet directly.

On the receiving end, the FortiGate unit or FortiClient removes the extra layer of encapsulation before decrypting the packet. The following nattraversal options are available under phase1 settings of an IPsec tunnel. It has been observed while establishing an IPsec tunnel between FortiGate and another vendor unit that either the tunnel does not get established or traffic does not flow through an IPsec tunnel.