Implementing VPN Virtual Private Networks for Small Offices/Organizations


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The document tries to show the challenges, the benefits costs and the security implications that come up with the Virtual Private network TEchnology.

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Implementing VPN Virtual Private Networks for Small Offices/Organizations

  1. 1. IMPLEMENTING A LOCAL AREA NETWORK (LAN) BETWEEN REMOTE OFFICES USING VIRTUAL PRIVATE NETWORK (VPN)What challenges, benefits, cost and security implications there are Sovello Hildebrand Mgani IT Consultant - FUGIT Consult Tanzania
  2. 2. Outline: Definitions: LAN, VPN, WAN, etc. Connecting distant-located offices: what options there are. VPN: Advantages VPN: Options VPN: How it works VPN: Challenges
  3. 3. Definitions LAN: (Local Area Network): covers a small area. Usually confined to a small building or several building concentrated at one place. VPN: a private data network that uses existing telecommunication infrastructure.  VPN and Privacy: is achieved through the use of tunneling protocols and security procedures. WAN: (Wide Area Network): covers a larger geographical area. It was the option for decentralized organizations before.
  4. 4. Connect distant offices An organization can have offices distributed around a metropolitan. Before, these offices would connect using leased lines: imagine there being 10+ branches of the same organization. VPN came out as a solution. Each office needs to have its own internet connection so that VPN can create its tunnel through.
  5. 5. VPN: Advantages Reduced costs: running costs, only startup costs may be high e.g. buying a server (only if need be) Scalability: new offices can be added without having to worry about the capacity of the connection line. Only the internet is needed. Flexibility: allows working from any point in time: at home, along the road, outside the country, etc. Performance: the data transfer rates depends on the speed of the internet connection to the office.  Compared to the case of a leased line.
  6. 6. VPN: Options Site-to-Site VPN: Remote Terminal:
  7. 7. VPN: How it works There needs to be an internet connection. VPN uses existing telecommunications infrastructure. VPN creates a tunnel through the internet from one office/site to another. The traffic through this tunnel is encrypted to protect any sensitive data. Each network can connect to the main office’s network and then to the other branch offices.  Requirement: Internet connection, a VPN server for each location, and an IP address to authenticate to.
  8. 8. Picture: Courtesy of
  9. 9. VPN: Challenges Cost: setup costs may be very large, however running costs are reduced to a minimum. Security: though VPN creates a tunnel in the Internet, it is still possible to be interfered if at all the network access credentials are not kept confidential.