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How the Internet Works

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How the Internet Works

  1. 1. How the Internet Works From “www.google.com” onwards http://willbradley.name/how-the-internet-works @willbradley CactusCon 2014
  2. 2. Connections and Protocols “7 Layer OSI Model” Mostly theoretical. Note: ARP/MAC, IP, TCP, DNS, H TTP.
  3. 3. Packets (in Wireshark)
  4. 4. DNS Lookups Recursion! Root: . TLD: .org. NS: heatsynclabs.org. IP: 72.44.240.228
  5. 5. Subnets and Masks Binary! Addresses “in” this network start with “011”: 95: 0101 1111 96: 0110 0000 97: 0110 0001 98: 0110 0010 … 100: 0110 0100 … 124: 0111 1100 125: 0111 1101 126: 0111 1110 127: 0111 1111 128: 1000 0000
  6. 6. NAT (actually PAT)
  7. 7. Real Routing (BGP!)
  8. 8. Port Forwarding / Firewalls
  9. 9. Ethernet (100 BASE T)
  10. 10. Subnetting Issues
  11. 11. DNS Cache Poisoning
  12. 12. Switching and Broadcast Storms
  13. 13. ARP Spoofing / MITM

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