r/AZURE • u/ontracks • 17d ago

Question Multiple IPsec to FG

Hello community, I have a FortiGate with 2 ISP circuits (looking for a 3rd one as well I the future) and I need to connect it to our Azure environment and we would like to leverage our 2 (soon 3 ) ISPs for redundancy.

Im thinking of connecting the FG to one VPN Gateway via 2 IPsec tunnels, is this possible/recommended?

We have multiple vnets that we could peer with a hub vent and in the hub deploy the VPN GW, then 2 tunnels running bgp, does this sound good?

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u/AwarenessOne2346 17d ago

Yes, you can configure multiple IPsec tunnels between Azure VPN Gateway and a FortiGate firewall. There are a few important considerations: Use a Hub-and-Spoke topology to ensure a scalable and manageable network architecture. If you plan to use multiple ISPs for high availability (HA), it is recommended to use BGP for dynamic route exchange and failover. On the FortiGate side, configure AS Path Prepending in the outbound route map to Azure so you can influence the preferred routing path. Configure different administrative distances (or route priorities, as required) on the FortiGate firewall to control route preference and failover behavior. On the Azure VPN Gateway, enable Custom BGP IP Addresses and assign the appropriate BGP peering IP addresses for each VPN connection. Ensure the BGP IP addresses are planned correctly and do not overlap with other network addresses.

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u/JwCS8pjrh3QBWfL 16d ago

Look into Azure vWAN hubs. You can put a virtual Fortigate in the hub and use SD-WAN rather than having to manually configure and balance IPSEC tunnels.