[Novalug] Point multiple IPs to one server?
joel at fouse.net
Thu Jan 3 13:14:43 EST 2008
Hmm...a follow-up question on this. What about when the box is actually
on a vlan, and currently it only "knows" (at the OS level) of an
internal IP address (192.168-type) but it receives traffic from a public
routable IP? For the time being (pre-multiple-IPS) it works fine,
because Apache is just configured to listen to any port 80 traffic. How
does the multiple public IP thing work out in this scenario, through to
the Apache configs?
On Wed, 2008-01-02 at 19:58 -0500, Joel Fouse wrote:
> You guys filled in the blanks for me, and nicely. Thanks much!
> - Joel
> On Wed, 2008-01-02 at 18:37 -0500, Joel Fouse wrote:
> > 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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