[nsp] Port 80 redirect

[matthew zeier]

> The interesting part is the server side - you can do alias interfaces, or
> transparent proxying (for example via squid), and so on.  Depends on the
> operating system used and whatever experience you have with the possible
> web server / web proxy variants you have.
>

Say Linux - how's the magic done there?

I'm trying to do something similiar for some wireless hotspots we're putting
up but also want to push people to a site that pops up some sort of ad for
my company.