Thanks for your reply.
Server Lan: 10.252.252.0/24
ETH00: 10.252.252.252 Mask 255.255.255.0
VPN99: 10.252.251.254 Mask 255.255.255.0
OpenVPN: 10.252.251.1 – 10.252.251.253
Source NAT enabled.
I added 10.252.252.0/24 in “IP Traffic to tunnel through VPN”.
Now, end computer can dial in, and the route of internet accessing is right. But it cannot access my servers in Server Lan. Andalso, cannot Ping to 10.252.251.254.
How to fix it?
Or, is that possible to make the VPN clients in the same subnet of my server lan without gateway?