To exclude some network to use the pre existing gateway (client's default GW prior to VPN) when VPN is configured as default gateway.
- Go to: Connectivity >> SSL VPN
- Get into the edit mode of SSL VPN Server
- In the 'Custom Options' enter - push "route <IP> <NM> net_gateway";
- Save the settings.
Replace <IP> and <NM> with IP address and subnet mask