[svlug] Masq problem w/ ipchains

Steve M Bibayoff smb23 at csufresno.edu
Fri Jun 8 11:59:01 PDT 2001


From: Todd Lyons <todd at mrball.net> wrote:

> I think source should be 172.16.23.0/24.  .20.0 is your external
> interface.  I don't think you want to masquerade your external
> interface to the rest of the world.

Actually, going over the setup again, .20.0, .21.0, and .23.0 is my 
internal net. Here is a crude ascii description to try and make it 
clearer. The only thing I could change is the eth1, as all the 
transmitters and reciever ip's are hardcoded, and supposly it's tied 
into eth0 with an ip of 172.16.23.200, or it doesn't work right(haven't 
figured out why, just been told that):

----------------      ----------------
|  laptop1     |      |  laptop2     |
| 172.16.20.80 |      | 172.16.20.81 |
----------------      ----------------
       |                     | 
       |                     |
----------------      ----------------
|  voice unit1 |      | voice unit2  |
| 172.16.21.80 |      | 172.16.21.81 |
----------------      ----------------
       |                     |
       |                     |
-----------------     -----------------
| transmittier1 |     | transmittier2 |
| 172.16.22.80  |     | 172.16.22.81  |
-----------------     -----------------
       |                     |
      /|\                   /|\
      RF                    RF
      \|/                   \|/
       |_____________________|
                 |
          -----------------
          | base reciever |
          | 192.168.3.1   |
          -----------------
                 |
                 |sl0 172.16.23.201
              --------------
         eth0 | linux box  |
       -------| router/    |
172.16.23.200 | gw/masq    |
              --------------
              eth1 | 
      172.20.20.27 |
                   |
            outside world
    not really outside presently,
    but instead on an internal LAN
    for testing purposes





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