Routing issue

Hi

I have three network devices which are responsible for the internet connection.

One Zyxel Modem which handles the connection to the ISP
One Linksys Router which handles the internal network and also talks direct to the zyxel with their public ip addresses.
And finally, a third device which is a vpn box which connects into the corporate network.

I would like to force any traffic for the address range 172.26.101.x to go through the vpn dialler which sites on 192.168.10.253 local network

Ive tried settomg a static route on the linksys but it say bad address range. Any ideas how I can force all traffic to the device 192.168.10.253?

Thanks
D