VPN — Packet.School

VPN

VPN creates a secure, encrypted tunnel over the internet.

Duration

2min

Level

Type

Lesson

Progress

4/ 6

01What is VPN?

code

[Your PC] ══════════════════════════ [Company Network]
             Encrypted Tunnel (VPN)
             Over the Internet

Virtual: Software-based, not physical
Private: Encrypted, secure
Network: Network connection

02VPN Use Cases

1. Remote Access

code

Work from home → VPN → Company network

2. Site-to-Site Connection

code

Branch A → VPN Tunnel → Main Office

3. Privacy

code

You → VPN Server → Internet
        ↓
   Your IP is hidden

4. Bypassing Geographic Restrictions

code

Turkey → US VPN → US Netflix

03VPN Protocols

Protocol	Security	Speed	Usage
OpenVPN	High	Medium	Most common
WireGuard	High	Very High	Next generation
IPSec	High	Medium	Enterprise
L2TP/IPSec	Medium	Low	Legacy
PPTP	Low	High	Don't use!

04How VPN Works?

1. Connection Setup

code

Client → Authentication → VPN Server
         (user/password or certificate)

2. Tunnel Creation

code

[Original Packet] → Encryption → [VPN Packet]

Original:
[IP Header][TCP][Data]
        ↓
With VPN:
[New IP][VPN][Encrypted(IP+TCP+Data)]

3. Data Transmission

code

Encrypted data → Internet → VPN Server → Decryption → Destination

05Enterprise VPN Scenario

code

                    Internet
                       |
        ┌──────────────┼──────────────┐
        |              |              |
    [Home]        [Branch]      [Mobile]
        |              |              |
        └──────────────┼──────────────┘
                       |
                 [VPN Gateway]
                       |
                 [Company Network]
                    /     \
               Server   Files

06VPN Types

Remote Access VPN

Single user connection
Work from home
SSL VPN common

Site-to-Site VPN

Connection between two networks
Between branches
IPSec common

07Split Tunneling

Full Tunnel:

code

All traffic → VPN → Internet
(slow but secure)

Split Tunnel:

code

Company traffic → VPN
Internet traffic → Direct
(fast but risky)

08VPN Security

Provides:

✅ Encryption (data can't be read)
✅ Authentication
✅ IP hiding
✅ Man-in-the-middle protection

Doesn't Provide:

❌ Anonymity (VPN provider can see)
❌ Malware protection
❌ 100% privacy

09Summary

VPN = Encrypted tunnel over internet
For remote access and security
OpenVPN and WireGuard recommended
Split tunneling balances performance/security

VPN

VPN creates a secure, encrypted tunnel over the internet.

Duration

2min

Level

Type

Lesson

Progress

4/ 6

01What is VPN?

code

[Your PC] ══════════════════════════ [Company Network]
             Encrypted Tunnel (VPN)
             Over the Internet

Virtual: Software-based, not physical
Private: Encrypted, secure
Network: Network connection

02VPN Use Cases

1. Remote Access

code

Work from home → VPN → Company network

2. Site-to-Site Connection

code

Branch A → VPN Tunnel → Main Office

3. Privacy

code

You → VPN Server → Internet
        ↓
   Your IP is hidden

4. Bypassing Geographic Restrictions

code

Turkey → US VPN → US Netflix

03VPN Protocols

Protocol	Security	Speed	Usage
OpenVPN	High	Medium	Most common
WireGuard	High	Very High	Next generation
IPSec	High	Medium	Enterprise
L2TP/IPSec	Medium	Low	Legacy
PPTP	Low	High	Don't use!

04How VPN Works?

1. Connection Setup

code

Client → Authentication → VPN Server
         (user/password or certificate)

2. Tunnel Creation

code

[Original Packet] → Encryption → [VPN Packet]

Original:
[IP Header][TCP][Data]
        ↓
With VPN:
[New IP][VPN][Encrypted(IP+TCP+Data)]

3. Data Transmission

code

Encrypted data → Internet → VPN Server → Decryption → Destination

05Enterprise VPN Scenario

code

                    Internet
                       |
        ┌──────────────┼──────────────┐
        |              |              |
    [Home]        [Branch]      [Mobile]
        |              |              |
        └──────────────┼──────────────┘
                       |
                 [VPN Gateway]
                       |
                 [Company Network]
                    /     \
               Server   Files

06VPN Types

Remote Access VPN

Single user connection
Work from home
SSL VPN common

Site-to-Site VPN

Connection between two networks
Between branches
IPSec common

07Split Tunneling

Full Tunnel:

code

All traffic → VPN → Internet
(slow but secure)

Split Tunnel:

code

Company traffic → VPN
Internet traffic → Direct
(fast but risky)

08VPN Security

Provides:

✅ Encryption (data can't be read)
✅ Authentication
✅ IP hiding
✅ Man-in-the-middle protection

Doesn't Provide:

❌ Anonymity (VPN provider can see)
❌ Malware protection
❌ 100% privacy

09Summary

VPN = Encrypted tunnel over internet
For remote access and security
OpenVPN and WireGuard recommended
Split tunneling balances performance/security