Routing Multiple Inbound IP Addresses -- How?

[Janina Sajka]

Hi, Sina:

Didn't remember the term multihoming. I'll check that out.

So, here's my situation. My ISP provides me multiple ip addresses, if I
want them. I want to take advantage of that in a way I think is
appropriate. It would be easy if I just used the external, routable ip
addresses directly--one for each machine perhaps.

But, I want to keep my internal, nonroutable scheme intact. For one
thing, I have more machines than routable addresses. For another thing,
I'd like the freedom to use the routables by function, rather than
specific machine, meaning that I might migrate internally from one
machine to another at some point, without changing the externals.

So, how do I do that NAT? Let's say I have four IP addresses. They're
discontinguous. Internally, I have seven or eight machines (depending on
the day).

Here's what I know I can do. I can route traffic arriving on address A
port 80 to machine A-Prime port 80, and route traffic arriving on
address B port 80 to machine B-Prime.

But, can I route traffic arriving on address C, whatever port, to
machine C-Prime? Without specifying all the particular ports one at a
time? Or as some kind of gargantuan range like 1-32767?

Sina Bahram writes:
> Hi Janina,
> 
> Can you provide a little more information.
> 
> When you say over your dsl, do you mean that your dsl modem is going to be
> assigning more than one IP address to you? If so, then you're wanting
> something like multihoming, although if you want to pass those IP's along,
> as you said, they are routable ... Then that's a different situation.
> 
> Could you explain the specifics in greater detail please?
> 
> Take care,
> Sina
> 
> -----Original Message-----
> From: speakup-bounces at braille.uwo.ca [mailto:speakup-bounces at braille.uwo.ca]
> On Behalf Of Janina Sajka
> Sent: Monday, November 28, 2005 10:12 PM
> To: speakup at braille.uwo.ca; ma-linux at tux.org; blinux-list-bounces at redhat.com
> Subject: Routing Multiple Inbound IP Addresses -- How?
> 
> This is fairly basic, I'm sure. But, for the life of me, I can't find
> documentation on it.
> 
> So, here's the situation ...
> 
> I have several routable IP addresses. All of them need to come through the
> same interface, over my DSL to be specific. So, how can I route based on IP
> alone? I know how to route by port, but how do I do it by IP address?
> 
> All examples/help much appreciated.
> 
> 
> -- 
> 
> Janina Sajka				Phone: +1.240.715.1272
> Partner, Capital Accessibility LLC	http://www.CapitalAccessibility.Com
> 
> Marketing the Owasys 22C talking screenless cell phone in the U.S. and
> Canada--Go to http://www.ScreenlessPhone.Com to learn more.
> 
> Chair, Accessibility Workgroup		Free Standards Group (FSG)
> janina at freestandards.org		http://a11y.org
> 
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-- 

Janina Sajka				Phone: +1.240.715.1272
Partner, Capital Accessibility LLC	http://www.CapitalAccessibility.Com

Marketing the Owasys 22C talking screenless cell phone in the U.S. and Canada--Go to http://www.ScreenlessPhone.Com to learn more.

Chair, Accessibility Workgroup		Free Standards Group (FSG)
janina at freestandards.org		http://a11y.org