Networking :: Multi Tenant VPN Remote Access ASA 5510

I have a situation here where the company is rapidly expanding through acquisition. They are essentially a holding company and own several smaller entities. However most IT is consolidated as new entities are brought in and run out of Headquarters because the Board of Directors/Executive Mgt do not see IT as important and so the budget is extremely limited.

They have approximately 200 remote users at any given time, but they all work for these smaller entities. Currently each location has its own Dedicated Internet Access and VPN appliance (Netgear ProSafe, Cisco ASA 5510, I know of one entity that is just port forwarding to each workstation for RDP ).

They would like to route all traffic back through Corporate so they can consolidate this VPN mess and quit paying for all different kinds of licensing, and also stop paying for dedicated internet access for each location and just use the MPLS and have all traffic inbound/outbound run out of the corporate office.

The only issue is they dont want users to be able to access network resources at other organizations.

Like I said earlier the Board of Directors/Executive Mgt do not see IT as important and so the budget is extremely limited; so if there is an OpenSource option available that would be best. Also the IT dept there is 3 people (IT Manager (IBM AS400 guy), two Helpdesk guys (no certs, HS GED)) So the knowledge resources are limited as well.