A GRE Genereic Routing Encapsulation is a tunneling protocol that allows data to be encapsulated and sent over a simulated point-to-point link. The beauty of it is that it will encapsulate many different types of traffic and De-encapsulate it on the other. I have seen this be a great troubleshooting tool when an MPLS might be blocking traffic.
Traffic will then be encapsulated from the source and de-encapsulated and forwarded normally on the remote end point. The process is relatively straight forward and simple. First we need to create our GRE tunnel. The two sites we will be creating the tunnel on are Site-A, and Site-B.
Now we can create the static route pointing my remote traffic Now lets see if we can ping across our tunnel. As shown below pings work great! Pinging both the tunnel interface and across the tunnel are great ways to check if this tunnel light ballast wiring diagrams completed actually working. Odds are if you have enabled ping on the tunnel interface, and cannot ping it from the other side then the tunnel is not working.
Also, check the Firewall policy count to make sure it is increasing with traffic — if so everything is working. Hey ARLM, thanks for the comment.
I have been wanting to blog on that. Currently i got an issue with cisco and fortigate D. TravelingPacket — A blog of network musings. That should be it. Share this: Twitter Facebook. Like this: Like LoadingJoin us now! Forgot Your Password? Forgot your Username? Haven't received registration validation E-mail?
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Forum Themes Elegant Mobile. Essentials Only Full Version. Bronze Member. By the way i'd like to modify 1 remote-gateway. I've tried via CLI but i get an error : unexpected to change gateway address! Expert Member. I don't think you can modify the tunnel entries after it's configured.
Silver Member. It's a bad new, this firewall is in production and i can not reboot it as i want. I have a lot of policies so it is impossible to delete and renew the tunnel :.Join us now! Forgot Your Password? Forgot your Username?
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Essentials Only Full Version. Georges Orwell. Bronze Member. Delete Tunnels Hello all, I just created site to site tunnel to trainning but now i can' t delete it. Can you help me? Fortigate D Forti OS 5.
Thank you Georges Orwell. Is the tunnel interface-mode? There must be a policy or a route referencing that tunnel and it won' t let you delete it unless you delete those first. Try again when the Ref. Delete the Phase 2 first, then Phase 1. Attached Image s. Silver Member. Common references include routes, firewall objects, firewall policies, and phase-2 vpn objects. Gold Member. If you don' t find the reference, you can backup your configuration and search the VPN interface name in your configuration.
I don' t know what is difference between policy mode and interface mode. I' m newbees. Add the colomn " ref" and you will see how it is used on the right, you will see a number.A VPN connection has multiple stages that can be confirmed to ensure the connection is working properly. It is easiest to see if the final stage is successful first since if it is successful the other stages will be working properly. Otherwise, you will need to work back through the stages to see where the problem is located.
When a VPN connection is properly established, traffic will flow from one end to the other as if both ends were physically in the same place. If you can determine the connection is working properly then any problems are likely problems with your applications.
Otherwise, use the IP address of the first interface from the interface list that has an IP address. The first diagnostic command worth running, in any IPsec VPN troubleshooting situation, is the following: diagnose vpn tunnel list.
This command is very useful for gathering statistical data such as the number of packets encrypted versus decrypted, the number of bytes sent versus received, the SPI identifier, etc. This kind of information in the resulting output can make all the difference in determining the issue with the VPN.
This command will inform you of any lack of firewall policy, lack of forwarding route, and of policy ordering issues. The following is a list of such potential issues. Bear in mind that the troubleshooting suggestions below are not exhaustive, and may not reflect your network topology.
If you are still unable to connect to the VPN tunnel, run the following diagnostic command in the CLI: diagnose debug application ike -1 diagnose debug enable. The resulting output may indicate where the problem is occurring. When you are finished, disable the diagnostics by using the following command:. This will provide you with clues as to any PSK or other proposal issues.
If it is a PSK mismatch, you should see something similar to the following output:. The most common problem with IPsec VPN tunnels is a mismatch between the proposals offered between each party. Without a match and proposal agreement, Phase 1 can never establish. Use the following command to show the proposals presented by both parties. The resulting output should include something similar to the following, where blue represents the remote VPN device, and green represents the local FortiGate.
To confirm whether a VPN connection over LAN interfaces has been configured correctly, issue a ping or traceroute command on the network behind the FortiGate unit to test the connection to a computer on the remote network. If the connection is properly configured, a VPN tunnel will be established automatically when the first data packet destined for the remote network is intercepted by the FortiGate unit. If the ping or traceroute fail, it indicates a connection problem between the two ends of the tunnel.
This may or may not indicate problems with the VPN tunnel. A green arrow means the tunnel is up and currently processing traffic. A red arrow means the tunnel is not processing traffic, and this VPN connection has a problem.This allows the source and destination switches to operate as if they have a virtual point-to-point connection. The beauty of it is that it will encapsulate many different types of traffic and de-encapsulate it on the receiving end.
So, preplanning and staging your networks is incredibly important before you begin to implement GRE tunneling. Traffic will then be encapsulated from the source and de-encapsulated and forwarded normally on the remote endpoint. The process is relatively straightforward and simple. First, we need to create our GRE tunnel. Now we can create the static route pointing my remote traffic As shown below, pings work great!
Odds are if you have enabled ping on the tunnel interface, and cannot ping it from the other side then the tunnel is not working.
No Comments.FortiGate: Basic Configuration - FortiOS 6.4.0
That should be it! If you have questions about configuring your GRE tunnel or about FortiGates in general, you can email us or give us a call at !
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Next Post Understanding Network Bottlenecks. Contact Lyndon Farm Ct.Use this command to configure global settings that affect FortiGate systems and configurations. The following table shows all newly added, changed, or removed entries as of FortiOS 6. You can override this minimum version for individual configurations. Enable or disable Security Rating results to be sent to FortiGuard, and enable by default or disable scheduled runs of Security Rating.
When schedule is enabled, Security Rating is run every four hours, or every one hour if a config change occurs. Support for a global option to enforce all login methods to require an additional authentication factor, in order to comply with PCI 3.
Enable or disable by default authenticated users lifetime control. This is a cap on the total time a proxy user can be authenticated for after which re-authentication will take place. Once enabled, set the lifetime timeout in minutes. Set the range between The default is set to or 8 hours. The timeout option is only available when proxy-auth-lifetime is set to enable.
Once enabled, set the timeout in minutes for authenticated users. Default is enable. Use policy-auth-concurrent for firewall authenticated users. Specify a console login timeout that overrides the admintimeout value.
Zero value disables the timeout. Default is 0. Not available on low-crypto FortiGates. Default is disable.
6.0.9 Unable to Receive SSL VPN Tunnel IP Address
Default is tlsv tlsv Repeated failed login attempts will enable the lockout. Use admin-lockout-threshold to set the number of failed attempts that will trigger the lockout.
Default is Set the number of failed attempts before the account is locked out for the admin-lockout-duration. Default is. Default is 3. Set the maximum number administrators who can be logged in at same time. Range: 1 - When enabled, the maintainer account can be used to log in from the console after a hard reboot.
The password is "bcpb" followed by the FortiGate unit serial number. You have limited time to complete this login.
Site-to-site IPsec VPN with overlapping subnets
Specify the administrative access port for HTTP. The SCP commands must include.Join us now! Forgot Your Password? Forgot your Username? Haven't received registration validation E-mail?
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Essentials Only Full Version. Mark Oakton. Gold Member. I want to have the LAN range the same on both sides, e.
Bronze Member. Hi You can vpn between the overlapping network using the static nat or pat. IPsec is L3 tunnel. How will machines on each side know to go to the default gateway? If they send out a packet on the local lan layer 2 to mac address how will that get picked up by the firewall and sent up the tunnel?
X will be natted statically to Y on site1 and Z on the site2. So when Site1 access the site2, site1 hits the Z network, and Site1 firewall will nat the X to Y before they are encrypted to ipsec tunnel and Site1 firewall knows where the Z network is located, when packets are reached to site2 LANsource will Y, destination will be Z.
Now Site2 will dnat the Z to X, leave the Y as it is, when the packet finally reaches to Site2, source Y, destination is X, problem solved!!! When packet returns from site2, source is X, destination is Y.
Now the X to snat'ed to Z, leave Y as it was as its not site2 nat job. When packets are reached to site1, source is Z, destination is Y, now Y is dnat'ed to X, leave source as it is. As you see, there is no mac, arp issue. If you perform the network to network nat, ip translation will happen this way- Latest Posts. Active Posts.
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