Computer Networking › Section H · Security in computer networks › Topic H.7
IPsec and virtual private networks
TLS protects one application's connection at a time. IPsec works one layer lower and protects every datagram travelling between two hosts or gateways, which lets an organisation build a private network out of public internet links.
In this topic
- Security for every datagram
- Virtual private networks
- AH and ESP; transport and tunnel mode
- Security associations
- Inside an ESP tunnel-mode datagram
- Worked example: a datagram between two offices
- Worked example: the cost in bytes
- IKE: setting up SAs automatically
- VPNs today
- Common mistakes to avoid
- Key takeaways
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