How the Internet Works From “www.google.com” onwards http://willbradley.name/how-the- internet-works @willbradley CactusCon 2014
How the Internet Works
Jan 27, 2015
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How the Internet Works
From “www.google.com” onwardshttp://willbradley.name/how-the-internet-works
@willbradleyCactusCon 2014
Connections and Protocols
“7 Layer OSI Model”
Mostly theoretical.
Note: ARP/MAC, IP, TCP, DNS, HTTP.
Packets (in Wireshark)
DNS Lookups
Recursion!
Root: . TLD: .org. NS: heatsynclabs.org.IP: 72.44.240.228
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
NAT (actually PAT)
Real Routing (BGP!)
Port Forwarding / Firewalls
Ethernet (100 BASE T)
Subnetting Issues
DNS Cache Poisoning
Switching and Broadcast Storms
ARP Spoofing / MITM
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