OpenVPN конфиг - что такое redirect-gateway def1

def1 -- Use this flag to override the default gateway by using 0.0.0.0/1 and 128.0.0.0/1 rather than 0.0.0.0/0. This has the benefit of  overriding but not wiping out the original default gateway.
Using the def1 flag is highly recommended, and is currently planned to become the default by OpenVPN 2.1.

def1 делит шлюз на две подсети: 128.0.0.1/1 и 0.0.0.0/1, а не передает 0.0.0.0