Forum OpenACS Development: Re: Multiple DNS and subsites
There are an abundance of benefits to switching to naviserver and upgrading to oacs-5-9, if the system isn't using ecommerce package.
Here is an example of host-node mapping working as I believe you expect. One of the host-node sites: http://dekka.com which points to subsite: http://or97.net/dekka-com
(It just serves a static page right now; until we re-tackle the various templating / form issues.) No proxy is used.