When connecting to your company's VPN you may find yourself needing to add routes to your DMZ servers. You can automate this process by installing an new launchctl (like cron for OS X) that runs a script like the following every minute (your routes and interface name may vary).
connected=$(ifconfig | grep ppp0)
if [ -n "$connected" ]; then
added=$(route get -net 192.168.200 | grep ppp0)
if [ -z "$added" ]; then
logger "VPN connection detected, adding routes"
sudo route -n add -net 192.168.200 -interface ppp0
sudo route -n add -net 192.168.170 -interface ppp0