Given B has a connection to both A and C, if B is properly configured A and C should already be capable of talking to eachother without any additional VPNs. There are many ways to configure B to do this depending on what kind of applications you run that needs to talk from A to C, and depending on which kind of VPN (Layer 2 or 3) you're using.
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Given B has a connection to both A and C, if B is properly configured A and C should already be capable of talking to eachother without any additional VPNs. There are many ways to configure B to do this depending on what kind of applications you run that needs to talk from A to C, and depending on which kind of VPN (Layer 2 or 3) you're using.