How to use fwtk on linux with dual-network (Private Network + Network class C)

1. private network -VPN-private network routing

I have set up a VPN with an SSH tunnel with the following topology
192.168.0.7
    |
------------------------
|192.168.0.1(PRIVATE)   |
|a.a.a.a(PUBLIC CLASS c)|____
------------------------    |
                            |
                        -----------------
                        | 192.168.253.2 |
                        |  ssh-ppp-vpn  |
                        |               |
                        | 192.168.253.3 |
                        -----------------
                            |
------------------------    |
B.B.B.B(public CLASS C)|____|
10.240.2.11(CLASS C)   |
------------------------
    |
    |
------------------------
10.240.2.2             |
------------------------

I have set the routing up such that I can ping every ip address on the
A  and B internet(public) machines and the ppp tunnel. But if I am on
either machine 10.240.2.2 or 192.168.0.7, I cannot ping from public to
oposite private or from private to private.  I have enabled IP
forwarding on both boxes.  Machine A is redhat 6.2 machine b is redhat
7 if that matters.  Any body have any idea what I should check to
enable private network to private network communication.

Todd
--
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Todd Gruben
Daring Technologies
Austin Tx

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