El experimentador que no sabe lo que está buscando no comprenderá lo que encuentra. (Claude Bernard).
How to configure IPsec VPN between Fortinet and Sophos Firewall
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Thank to: https://ictfella.com/
This post is to document the process to configure static IPsec VPN between Fortinet and Sophos Firewall.
Environment
1x Fortinet Fortigate Firewall cluster running at active-passive mode
1x Sophos UTM Firewall
Both sides have static public IP assigned
Phase 1 and Phase 2 use the same encryption (AES256) and authentication (SHA256) algorithm, Group 14 or Group 5 are selected for the Diffie-hellman process.
Configure Fortigate firewall
Go to “VPN” – “IPsec Wizard”, start the new VPN wizard, give it a sensible name and choose “Custom” as the template type
Give it a name, choose “static IP address” in Remote Gateway, put Site b public IP address in and choose your “WAN” port as the source interface
In the Authentication and Phase1 Proposal section, we have chosen
1. Pre-Shared Key
2. IKE V1
3. Main (ID protection) mode
4. AES256 for Encryption and SHA256 for Authentication
5. Diffie-Hellman Groups 14 and 5
6. Key lifetime: 86400 seconds
7. XAuth: disabled
In Phase 2 Selectors, we have defined the local and remote subnets, the same encryption and authentication for the phase2 proposal:
Add a new route to go to Site B subnet:
Add needed policy on both ways to allow the inter-site traffic, please make sure NAT is disabled for inter-site traffic
Sophos UTM Firewall
In the “Remote Gateway” tab, add a new remote gateway to march up the Fortigate firewall configuration
In the “Policies” tab, add a new IPsec Policy to match up the Fortigate firewall configuration
In the “Connection” tab, link the remote gateways and policies together, make sure the new IPsec connection is switched on.
Bring up the IPsec interface in the Fortigate firewall
Go to the “Dashboard” – “Network” -“IPsec” widget, you can see your IPsec interface status
If you want to manually bring up the IPsec interface, click into the widget and bring it up
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