OpenVPN Setup

We are looking on security solutions for our client using OpenVPN. We go through the arthicle in : [login to view URL] We found all the following are matching to our clients environments : ~ Securely accessing company resources from anywhere ~ Site-to-site connections to bring networks together ~ Multiple networks, subnets, gateways, and servers Most of our clients are using Dynamic IP Internet Service. We need OpenVPN handle the situation where both ends of the connection are dynamic IP. We would like to know the cost & requirements to setup the following scenarios. Please indicate the OpenVPN Server where to install as well : 1) Securely accessing company resources from anywhere : ~ Customer local office computers / mobile users wants to access the Cloud Virtual Private Server ~ Customer mobile users (from anywhere) wants to access the Server in the local office To setup : ~ Server in the local office connect to Cloud Virtual Private Server ~ 1 mobile user to access Cloud Virtual Private Server & Server in the local office 2) Site-to-site connections to bring networks together : ~ Connect Customers HQ to Branch A. Allow both sites to have communication. 2nd, Allow mobile users to access the Server in HQ or / and Branch A. ~ Connect Customers HQ to Branch A, B, C, D, etc. Allow the HQ Communicate to Branch A, B, etc. Or Branch to Branch. Allow mobile users to access the Server in HQ, A, B, etc To setup : ~ HQ Connect to Branch A ~ HQ & Branch A Connect to Cloud Virtual Private Server ~ 1 mobile user to access Cloud Virtual Private Server & Server in HQ & Branch A 3) Multiple networks, subnets, gateways, and servers : ~ We provide a OpenVPN Server (as a Host) for multiple customer to access their network. Each customer cannot access other customer network. To setup : ~ Setup a OpenVPN Server for multiple network. Different customer to access their own network. Each customer cannot access other customer network. Involving HQ connect to Branches as well.