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Site-to site VPN fortigate and cisco router

Posted on 2015-02-06
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Last Modified: 2015-02-07
Hello;
How can i configure site-to site IPSEC VPN between fortigate (dynamic IP) and Cisco router(static IP)?
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Question by:PMCCCC
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btan earned 500 total points
ID: 40595553
key is to ensure the IPSec phase 1 and 2 setting are same in Fortigate and Cisco, you can check out the Dynamic IP (you need an account from the dynamic dns service subscribed) in guide and note this
IPsec VPN expects an IP address for each end of the VPN tunnel. All configuration and communication with that tunnel depends on the IP addresses as reference points. However, when the interface the tunnel is on has DDNS enabled there is no set IP address. The remote end of the VPN tunnel now needs another way to reference your end of the VPN tunnel. This is accomplished using Local ID.
(See Dynamic DNS over VPN section and the later section on an example for Branch 1 using static and Branch 2 for Dynamic) http://docs.fortinet.com/uploaded/files/1881/fortigate-ipsec-52.pdf

However, the above example is Fortigate at both each end, hence you can catch how to configure Cisco router (see R1) to pt to a Dynamic VPN device (example stated R2 and R3) in this. The key pt to note is use of "crypto isakmp key <Secret> address 0.0.0.0 0.0.0.0"  to define the remote as Dynamic
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/936-cisco-router-vpn-dynamic-endpoint.html

For interest, the below example is doing static part of Cisco and Fortigate. The GUI flow is useful
http://blog.webernetz.net/2015/02/02/ipsec-site-to-site-vpn-fortigate-cisco-router/
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by:PMCCCC
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Thanks btan that was very helpful.
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