How do make VPN client to access Internet through VPN server

Hi, I have following VPN server setup and would
like to have VPN client to access Internet
through the VPN server:

Our network id:
188.188.X.0 (internal network)
212.93.X.0 (IP from ISP)

The VPN server has 2 NICs connected both
network with IP address 188.188.X.5 and
212.93.X.5. The VPN server routing table is as
follows:

0.0.0.0/0.0.0.0 212.93.X.1 metric 25

We need to have our VPN client connected to
this VPN server for following:
1. Accessing internet network 188.188.X.0
2. Accessing the internet network via the same
VPN server

We are able to access Internet network but not
Internet. Please assist.