[Novalug] Point multiple IPs to one server?

[Joel Fouse]

I know that it's possible to have multiple public IP addresses pointed
at a single server, because webhosts offer static IP as a value-add.  I
also know that you can configure Apache vhosts to listen only to
specific IP addresses.  What I'm missing is what's in between, if
anything.  The point-multiple-IPs has to at least be configured external
to the box in question (at the router/switch/whatevernetworkingblackbox
level), but is there any configuration at the OS level to tell the box
to actually listen to all of them?  Or does it just take in whatever's
sent to it and Apache just slurps up whatever you've told it to?  Is
there any limit (hard or otherwise) to the number of IPs that can be
pointed to a single box?

If it helps target any answers, I'm partly just wanting to fill in my
knowledge in general, and partly referring to a specific box that's
currently on RHEL 4.

- Joel
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