topic GRE IPSec between Cisco 2811 and FortiGate 110C in VPN

GRE IPSec between Cisco 2811 and FortiGate 110C

laotalax579 — Sat, 22 Feb 2020 00:42:11 GMT

Hello,

Does anybody know if it is possible to configure GRE IPSec tunnel between Cisco 2811 router and FortiGate 110C firewall? I know that FortiGate supports IPSec and GRE tunnels, but maybe somebody succeeded in establishing an IPSec GRE between those routers? Could you also give a link to the appropriate documentation if it is possible?

Re: GRE IPSec between Cisco 2811 and FortiGate 110C

spremkumar — Fri, 18 Jun 2010 14:15:09 GMT

Is there any specific reason for planning to have GRE over there ? I would suggest checking the below links and the links embedded inside the link.

https://learningnetwork.cisco.com/thread/5400

regds

Re: GRE IPSec between Cisco 2811 and FortiGate 110C

laotalax579 — Fri, 18 Jun 2010 14:44:38 GMT

Hello,

the reason why I need GRE over IPSec is to pass RIP routing updates via VPN tunnel. I don't know if it is possible in Cisco IOS to configure IPSec VPN using crypto maps and pass routing updates via that tunnel.

Re: GRE IPSec between Cisco 2811 and FortiGate 110C

Federico Coto Fajardo — Fri, 18 Jun 2010 15:31:13 GMT

Hi,

You can configure the GRE tunnel on the 2811.

I'm aware that you can configure sort of a GRE tunnel on the Fortinet as well, but I have not seen a GRE tunnel between a Cisco and other vendor.

I've only seen GRE tunnels between Cisco devices (however I have not tried it to assure you that it will not work :-()

Federico.

GRE IPSec between Cisco 2811 and FortiGate 110C

Kevin Morales — Mon, 30 Sep 2013 23:11:03 GMT

Fortigate support Tunnel GRE!!,

GRE IPSec between Cisco 2811 and FortiGate 110C

Rejohn Cuares — Mon, 30 Sep 2013 23:19:28 GMT

Refer to this configuration guide.

http://docs.fortinet.com/fgt/handbook/fortigate-ipsec-40-mr1.pdf

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