Thanks again

> Then you could just fool the apps by having 'xyz.domain.com' in the
> /etc/hosts file (pointing it to wathever you want).

they cannot change that file (they basically cannot do anything on
those laptop other than running the legacy app, check email a browse
the web). Ah, these are Windows XP machines

> Yes, if you use DNAT it doesn't matter what kind of apps it is, the
> redirection is done at IP level.

I'm not quite sure how this would work. Example:

- they connect to the internet using the wifi of an hotel
- start the legacy app and the app tries to connect to
xyz.olddomain.com which doesn't exist anymore.

How can a DNAT on my server ?

> > Knowing this would apache + mod_proxy be enough? I really need a simple
> > solution, nothing complicated
>
> Well, I tend to think that using a proxy just to do an ip redirection is

it's not an IP redirection: the legacy app need to think it is
communicating with the non existent server xyz.olddomain.com and the
only way, seems to me, it to have it connect thgrough a proxy which
will do the trick and serve the content they need from the very same
server. :-)

Zork