Macbook, Leopard, USB CDMA modem and private network

Hi,
I have been searching all over for an answer and not found anything that works yet.
I am using a USB modem to access internet on my macbook. I also am connected to a private WAN network. I connect via my ethernet port to a PC running Mikrotik RouterOS which is my gateway to the WAN.
The router IP is 192.168.0.2.
The WAN uses the IP range 172.19...
I have set my ethernet port a manual IP of 192.168.0.5 with 192.168.0.2 (the routerOS gateway) as the gateway.
If I connect one of these, the other does not work, I assume because whichever is connected first becomes the default route. I have tried changing the service order under advanced network preferences with no luck.
I also tried adding a route : route add -net 172.19.0.0 -interface eth0
Neither of these worked. Any ideas?
Thanks in advance.

Any changes via the route command are transient and will go away when the machine reboots.
You have several options for making the route persistent - have the OS run a script at startup that adds the route.
Your best option would be to save your routes setup in a shell script (such as /usr/local/bin/addroutes) and add a launchd script to launch that at boot time, like:
/usr/local/bin/addroutes
#! /bin/sh
/sbin/route add -net 172.19 192.168.0.2
/Library/LaunchDaemons/local.customroutes.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>local.customroutes</string>
  <key>ProgramArguments</key>
  <array>
    <string>/usr/local/bin/addroutes</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>LaunchOnlyOnce</key>
  <true/>
</dict>
</plist>
The first file, /usr/local/bin/addroutes has the commands to execute while the .plist file runs the script at boot time.

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Hi Cowicide Moo,
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Macbook, Leopard, USB CDMA modem and private network

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