How to establish Hub and Spoke VPN between Nebula Devices (USG FLEX & NSG)?
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Zyxel_Adam
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In the Hub-and-Spoke VPN topology, there is a VPN connection between each spoke router and the hub router, which uses the VPN concentrator. The VPN concentrator routes VPN traffic between the spoke routers and itself.
![](https://us.v-cdn.net/6029482/uploads/editor/hr/209hjty3uo6j.png)
(Configure > Security gateway > Site-toSite VPN)
![](https://us.v-cdn.net/6029482/uploads/editor/5n/5a17i3n5z10z.png)
2. Select correct outgoing interface and toggle "Use VPN" on local interface that needs to be added to VPN tunnel.
![](https://us.v-cdn.net/6029482/uploads/editor/8r/jmsn08j62yza.png)
3. Enable Nebula VPN and choose Hub-and-Spoke for Nebula VPN topology.
![](https://us.v-cdn.net/6029482/uploads/editor/me/9tlwrrqa22ly.png)
(If you would not like to establish a VPN tunnel between spokes, keep it as disabled.)
4. Repeat step 1 to step 3 for all sites.
5. Check VPN connection result on Hub and spokes.
(Monitor > Security gateway > VPN connections)
Note: If you would like to build a Site to Site VPN in different organizations, please refer to this post.![](src)
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Adam
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