[Unbound-users] DNS multiplexer?

[João Damas]

Does anyone know of any code that will let one to run Unbound and NSD on the same IP address and still use port 53 for listening on both?

Something like a DNS multiplexer front end, so that the recursive server and the authoritative server are kept separate but the front-end directs queries to one or the other (either based on the RD bit, a locally configured list of zones, e.g. from NSD config, or some other way). Something that is lightweight but avoids having to burn additional IP addresses.

Thanks
Joao