Routing Multiple Inbound IP Addresses -- How?

[Sina Bahram]

Aha, I got you.

Ok, I need to look at iptables  rules, since I'm not up on them, but yes ...
This is possible.

Basically, what you want to do is have a gateway to more than one IP. This
is the inverse of a multicast IP which sends information that it receives to
multiple IP's, you sore of want it the other way ... Multiple IP's get
information but they go to a central location; however, you want to retain
the information of which IP it was sent to.

Now, I do have one question still. You do want to use NAT, correct? So at no
point in time do you want these computers to have public IP's? except of
course for your gateway ... Is that correct?

The reason I ask this is because it's the difference between talking about
pass throughs, and talking about redirection.

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: Tuesday, November 29, 2005 8:25 AM
To: Speakup is a screen review system for Linux.
Subject: Re: Routing Multiple Inbound IP Addresses -- How?

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

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