Hello,
I will install Openswan, ppp, xl2tpd to setup l2tp\IPsec server on the Centos machine.
Also i will need documentation and access to the real IP one of the modem via web interface or telnet.
After everything will be done you will get instructions on how to add and manage new VPN connections (add or delete user credentials).
This task should not take more than 8 hours.
Waiting for the reply.