VPNs - Teacher: Joseph Buckman PDF

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Teacher: Joseph Buckman...

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Lecture 10

MIS 307

Lecture Notes

VPNs 1. Virtual Private Network (VPN) 1. Allows you to connect entire networks or an individual computer with each other securely 2. Transparent to users 3. VPN Gateway: Allows us to encrypt messages and connect with a LAN over the Internet 1. Creates a tunnel between two devices or your computer and an office network 1. Virtual Circuit – when your computer believes it is directly connected to a LAN 2. Acts as a DHCP server 1. Responds with: 1. IP address of office 1 2. IP address of office 2 3. DNS server 3. Software receives network information and creates a new network interface on your computer and sets that as the default 4. SEE HANDWRITTEN NOTES 1.1 5. VPNs operate at either layer 2 or layer 3 (mostly layer 3 – more security options) 2. VPN Software 1. SEE HANDWRITTEN NOTES 1.2 2. Encapsulated Security Payload (ESP) 1. No one can read information sent unless you have a specific key that lets you decrypt it 3. Always use UDP with a VPN 4. Gateway takes off the Ethernet, IP, and UDP layers and sees there is an encrypted message. It decrypts the message, reads it, and repackages it with the destination address of the web server and sends it 5. When the destination web server sends a response and it gets back to the VPN gateway, the gateway encrypts the message and sends it to destination IP (e.g., your personal computer) 6. Happens every time you send any request (email, web request, etc.)...