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Maybe giving us a reason why you want to do this would help.. 

IMHO you need a combination of a router and a ip masq.

I can definatly give more ideas once I figure out why 
you would need this kinda config. 

Mike


On Thu, 19 Aug 1999, Alan Izzo wrote:

> /* HINT: Search archives @ http://www.indyramp.com/masq/ before posting! */
> 
> 
> 
> Hi all -
> 
> I have a question regarding the use of IPMASQ/PORTFW in a rather
> unconventional manner...  I have not looked at the code or tried to play
> around with configuring it to do what I am trying to do as I don't
> really think it will work, so I wanted to bounce it off you all first
> and get your thoughts...
> 
> I have made a feeble attempt at drawing what I want to do below.  What I
> have is a masq box with 3 Ethernet interface (2 local and 1 to the
> Internet via a cable modem).  With standard masq all of the traffic
> to/from the local networks gets translated into the single IP address of
> the interface that is connected to the cable modem (1.2.3.4 in my
> picture).
> 
> However, in my perverse model I want to have each internal network
> (192.168.0.x and 192.168.1.x in the picture) masq'ed to it's own
> different global IP address that has been assigned by my cable modem ISP
> (say, in my picture below, the ISP provided me with a block of 3 "real"
> IP addresses 1.2.3.4, 1.2.3.5 and 1.2.3.6).  I would like to masq all
> the traffic coming to/from the 192.168.0.x network masq'ed to the IP
> address 1.2.3.5 and all of the traffic coming to/from the 192.168.1.x
> network masq'ed to 1.2.3.6.  Can I do this with the current masq code (I
> am running on RedHat 5.2, Linux 2.0.36)?  If so, how do I configure it
> and can the port forwarding code handle this configuration as well (i.e.
> can I forward port 80 on IP address 1.2.3.5 to 192.168.0.2 port 80 AND
> forward port 80 on 1.2.3.6 to 192.168.1.2 port 80)? 
> 
> If masq/portfw can not do what I am trying to accomplish, do you all
> know of a way I can do it (i.e. another Linux feature like masq but
> different) that would allow me to accomplish this?
> 
> 
> 
>    +----------+
>     |          |        Ethernet
>     | A0-box   |:::::: 192.168.0.x
>     |          |.2   : 
>     +----------+     :
>                      :      +----------+      
>                      :   .1 |  Linux   | Ethernet  +-------+
>                      :::::::| Masq-Gate|:::::::::::| Cable |::: Internet
>     +----------+     :      |          |           | Modem |
>     |          |     :      +----------+           +-------+
>     | B0-box   |::::::        : .1      1.2.3.4
>     |          |.3            :
>     +----------+              :
>                               :  Ethernet
>                               : 192.168.1.x
>                               : 
>                               : 
>              ::::::::::::::::::::::::::::::
>              :                            :   
>              : .2                         : .3                
>         +----------+                 +----------+
>         |          |                 |          |
>         | A1-box   |                 | B1-box   |
>         |          |                 |          |
>         +----------+                 +----------+ 
> 
> 
> Thanks a lot for any help, ideas, comments etc.!
> 
> Alan
> 
> -- 
> Alan Izzo
> High Beam Software, Inc.
> 
> E-Mail: [EMAIL PROTECTED]
> 
> 
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> PLEASE read the HOWTO and search the archives before posting.
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> 

Wake up Mike..
The Matrix has you.



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