FIX: PPTP VPN access via Telstra NextG

Source: http://automatica.com.au/blog/2010/05/fix-for-pptp-vpn-access-via-telstra-next-g3g-wireless-internet/

Overview: Corporate IP address range (eg. 10.x.x.x/24) and NextG (eg. 10.x.x.x/8) are the same. The issue arises when the PPP connection adds a default route of 10.0.0.0/8 to PC forcing all traffic including corporate-network intended traffic through NextG route.

Resolution: Use split tunneling and have specific routes configured on VPN concentrator for all corporate subnets.

OR

Remove the 10.0.0.0/8 route from the routing table and reinstate after connection is dropped using scripts.