Private IP VPN CIDR Block(transit gateway) and Customer Gateway on the same Subnet

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Can someone Please explain why does the Customer Gateway IP Address have to be assigned from the CIDR Block in the Transit GW. I think this is a typo in the document.

https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-aws-site-to-site-vpn-private-ip-vpns/

In Step 4: The IP address to configure in the Customer gateway should be from the Transit Gateway CIDR block we defined in Step 2, and the BGP ASN the one from your on-premises environment.

Tarun
asked 2 years ago1212 views
3 Answers
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Hi Tarun,

You are correct. Please note information provided in the blogs is subject to change depending on when it was published so its best to cross check with the actual documentation of the service.

I suggest to refer below note from the documentation: https://docs.aws.amazon.com/vpn/latest/s2svpn/private-ip-dx.html

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If the Answer is helpful, kindly Mark the answer as 'accepted' answer, so it will help others in similar situation, Thank you.

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EXPERT
answered 2 years ago
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EXPERT
reviewed 4 months ago
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SUPPORT ENGINEER
reviewed 2 years ago
0

A response would be highly appreciated, This is a new feature from AWS and any insight on the documentation would be highly appreciated. I have posted various questions regarding private VPN over the direct connect but I am yet to hear from someone who has successfully implemented this feature.

Tarun
answered 2 years ago
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Hello!

We updated the blog post in October 2022 removing that typo: the customer gateway IP to configure does not need to be inside the range of the Transit Gateway CIDR block configure. What you need to make sure, as pointed out by Tushar, is that this IP does not overlap with the TGW CIDR block (as well as any CIDR block in AWS or your on-premises location).

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Pablo_S
answered a year ago
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EXPERT
reviewed 4 months ago

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