Re: Routing and setup questions for IPMasq and real IPs

[Joe Newbie <eibwen_xunil@yahoo.com>]

Pardon my intrusion...

But, can I get a little clarity...

Danny, you gave me a ray of light, but it is ever so
dim (my head's a bit thick from old age, I guess;
that, and being a l'il new to this penguin racket)But
you did say... "Lemme know if that was unclear. :)"

<a bit o'refresher>
> Date: Mon, 11 Mar 2002 22:33:46 -0600 
> From: Damacus <damacus@bastion.yi.org> 
> User-Agent: Mutt/1.2.5i 
> X-Disclaimer: PGP key available at request.  This
message is intellectually copywritten (C) 2001
Damacus. 
> X-Organization: I need to put my ORGANIZATION here. 
> X-Kernel: Linux obfuscated 2.4.14 
> X-Uptime: 10:31pm  up 1 day,  5:02,  6 users,  load
average: 0.11, 0.04, 0.01 
      only one day???
> Organization: Linux Users of Central Illinois 
> Precedence: bulk 

> You rock, Danny.
> Thanks a lot :)
> -Dam

> On Mon, Mar 11, 2002 at 04:54:54PM -0600, give or
take a bit, Danny Sauer wrote:
>> Just put the real IP on the internal computer, add
a static route on the
>> router machine, and set the ipchains rules to
forward traffic.
><snip>
</snip>
And he wrote some more:
> As long as the packets for the second IP address are
coming in on the router's interface
> to the internet, then the router will send them
along to the next appropriate
> hop (which is the machine itself).  The ISPs routers
should pick up on the
> MAC address of your router machine as their neighbor
to send packets for both
> IPs, and the router will know to forward along the
ones not destined for it.
> The IP connections are a series of hops, with each
router along the way only
> knowing which hop to send to next - not how to get
to the final destination.
> This is how my home network is set up, BTW.  I have
2 real IPs and one fake
> IP (my ISP masqs my connection).  The real IPs are
routed to my fake IP, and
> the machine listening there forwards those IPs to
virtual interfaces inside
> my house.  My router can't be directly reached from
the internet.  The drawback
> is that I need static routes for those machines,
which is a pain to maintain.
> I don't think there's a way around that when the
router is on the same physical
> network but not on the same logical network (and
thus, can't use netmasks to
> figure out the route).
</a bit o'refresher>
How will the dubious Insight (cable folks) (who NEVER
answer their email) ISP's router know to forward a
real IP number they never assigned though one I 'own'
without doing the nasty - the evil spoof? Your
explanation needs more for me to grasp an
understanding. I have a similar situation, a cable
modem connection to Insight, my linux box has two
NICs, one side connecting to the CabModem and bound to
the ISP's DHCP - so no 'real' static IP. The other NIC
is connected to my switch which has numerous boxes,
all having 192.168.x.x IPs. What do you mean when you
said - the Real IPs are routed to your fake IP? Am I
confusing what you are calling real and fake? I have a
couple of registered IP address names that are in
limbo and I haven't determined how to bind them so I
can host my own stuff - since Insight won't give me
anything resembling a static IP so I can register DNS
proper. My router is directly connecting to my cable
modem - so how is it yours can't be reached directly.
How is it you can broadcast (or do you) and resolve?
The IPMasq How-To confuses me... perhaps, therein lies
the wall...

Mayhap I need to read up on my rusting networking
basics...

Joe 

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