[plug] Routing problem with PPTP VPN

[Jeremy Malcolm]

Just wanting to get one or two fresh pairs of eyes to look at this problem,
because I'm out of ideas for now.

        .--[]-[]-[] 192.168.0.0/24 LAN   .--[]-[]-[] 192.168.1.0/24 LAN
        |                                |
   .----------. ppp0 .--------. ppp0 .-------.      
.--|Kalgoorlie|-----( Internet )-----| Perth |--.
|  `----------'      `--------'      `-------'  |
|  192.168.0.1                      192.168.0.40|
`------------------ PPTP VPN -------------------'
                   (/dev/ppp1)

Perth's gateway machine can ping Kalgoorlie fine over the VPN and vice versa. 
All of the machines on Perth's network can ping the Internet fine over IP
Masquerading.  But, none of the machines on Perth's network apart from the
gateway can ping Kalgoorlie over the VPN.

The routing table looks thus (irrelevant fields snipped):

Kernel IP routing table
Destination     Gateway         Genmask         Flags Iface
192.168.0.1     *               255.255.255.255 UH    ppp1
terminus.net.au *               255.255.255.255 UH    ppp0
192.168.1.0     *               255.255.255.0   U     eth0
192.168.0.0     192.168.0.1     255.255.255.0   UG    ppp1
default         terminus.net.au 0.0.0.0         UG    ppp0

Firewalling problems have been ruled out.

TIA

-- 
JEREMY MALCOLM <Jeremy at Malcolm.wattle.id.au> http://malcolm.wattle.id.au
Providing online networks of Australian lawyers (http://www.ilaw.com.au)
and Linux experts (http://www.linuxconsultants.com.au) for instant help!
Disclaimer: http://www.terminus.net.au/disclaimer.html. GPG key: finger.
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