S2S VPN with CIDR Conflict

00130896 1 Reputation point
2021-02-03T03:59:47.337+00:00

Hi,

Im trying to do S2S VPN with 2 cloud services that have the same CIDR Range. Both network cant make the adjustment on the CIDR, what is the best solution to overcome this issue?

63220-ipsec.png

Azure VPN Gateway
Azure VPN Gateway
An Azure service that enables the connection of on-premises networks to Azure through site-to-site virtual private networks.
1,394 questions
0 comments

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. suvasara-MSFT 10,011 Reputation points
    2021-02-03T06:31:21.097+00:00

    @HassanBasri-6020, You'll need to make sure that the IP address ranges for each of the local network sites that you want to connect to do not overlap. Otherwise, the portal or the REST API will reject the configuration being uploaded.

    For example, if you have two local network sites that both contain the IP address range 10.2.3.0/24 and you have a package with a destination address 10.2.3.3, Azure wouldn't know which site you want to send the package to because the address ranges are overlapping. To prevent routing issues, Azure doesn't allow you to upload a configuration file that has overlapping ranges.

    Please do not forget to "Accept the answer" wherever the information provided helps you to help others in the community.