Download - How the Internet Works
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How the Internet Works
From “www.google.com” onwardshttp://willbradley.name/how-the-internet-works
@willbradleyCactusCon 2014
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Connections and Protocols
“7 Layer OSI Model”
Mostly theoretical.
Note: ARP/MAC, IP, TCP, DNS, HTTP.
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Packets (in Wireshark)
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DNS Lookups
Recursion!
Root: . TLD: .org. NS: heatsynclabs.org.IP: 72.44.240.228
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Subnets and Masks
Binary!
Addresses “in” this network start with “011”:
95: 0101 111196: 0110 000097: 0110 000198: 0110 0010
…100: 0110 0100
…124: 0111 1100125: 0111 1101126: 0111 1110127: 0111 1111
128: 1000 0000
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NAT (actually PAT)
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Real Routing (BGP!)
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Port Forwarding / Firewalls
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Ethernet (100 BASE T)
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Subnetting Issues
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DNS Cache Poisoning
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Switching and Broadcast Storms
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ARP Spoofing / MITM