FusionAuth Cloud instances may or may not have static egress IP addresses; please open a support ticket with your instance name to learn more.

VPC peering is not currently supported, though that issue is the right one to follow for future developments.

You can also use an LDAP proxy to solve this issue.

FusionAuth -> LDAP proxy -> AD

where the LDAP proxy is in the DMZ and AD is configured to only talk to internal network values or the LDAP proxy.

Here's a StackOverflow post with more details.

FusionAuth doesn't support RADIUS at this time. Please feel free to file a feature request here: https://github.com/fusionauth/fusionauth-issues/issues

We do support LDAP through our connectors, a paid edition feature. More here: https://fusionauth.io/docs/v1/tech/connectors/ldap-connector/

Not currently. We've discussed it and haven't ruled it out.

However there are so many products, both free and commercial, that do this well.

You can always put a firewall on the server that FusionAuth is running or put a proxy in front of it.