The best option is IP-based VPNs that use the internet for the remote access. Secure IP-VPNs are networks that are secured by encryption and authentication, and layered on an existing IP network. There are different categories for VPN products:
- Hardware based systems
- Firewall based systems
- Standalone application packages
Before making any decision regarding the kind of VPN setup you plan to implement for your company, make sure that the setup meets the security, bandwidth and performance related requirements of your company.