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You can only use a single CGW for each VPN. To have a redundancy on the CGW side, you can create two VPN connections, each with different CGW.
You can either configure both tunnels for each VPN (you will have a total of 4 tunnels, each 2 tunnels terminated on a single CGW) or a single tunnel for each VPN (total of 2 tunnels, 1 tunnel terminated on each CGW).
The design is discussed here https://docs.aws.amazon.com/vpn/latest/s2svpn/vpn-redundant-connection.html
beantwortet vor 10 Monaten
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@Borja did you manage to find out? I'm currently trying to implement a similar approach and would pretty much like to know if the two tunnels from the different VPNs are in the same AZ or not.
beantwortet vor 5 Monaten
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Thanks for the response. Understood. If I have to create 2 CGWs with 2 VPN connections:
AWS would use different time for the endpoint update, hence AWS recommend two tunnels so that when one tunnel goes down during the endpoint update, the other tunnel stays up.
Yes, it would increase the cost by around $36 (the VPN cost) but not double it.
Good, thanks I cannot have both tunnels on the same VPN connection because I need to use a different pubic IP per tunnel on the CGW side. So I have e.g. CGW A with VPN Connection A and CGW B with VPN Connection B, and use a single tunnel on each VPN Connection. In this case, could AWS update at the same time my only active tunnel of both VPN connections?
About the design shown here https://docs.aws.amazon.com/vpn/latest/s2svpn/vpn-redundant-connection.html AWS is providing a different public IP for each tunnel on the same VPN connection. In my setup I am forced to do the same (for similar reasons). Therefore I need to setup a different AWS customer gateway for each public IP on my side. This means that on each VPN connection only one of the tunnels is configured and online. I know AWS would use a different time for the update of each endpoint. So in the diagram of the link above, since I would have only Tunnel 1 on each VPN connection, could it be the case that AWS is doing updates at the same time on Tunnel 1 of VPN Connection 1 and Tunnel 1 of VPN Connection 2?