--iroute network [netmask]
Generate an internal route to a specific client. The netmask parameter, if omitted, defaults to 255.255.255.255.This directive can be used to route a fixed subnet from the server to a particular client, regardless of where the client is connecting from.
And a question...
Can i define nested networks for two users in --client-config-dir ?
iroute 10.10.5.4 255.255.255.252 => first user
iroute 10.10.5.0 255.255.255.0 => second user