How To Break a Network
Talkat Open Source Summit Europe 2022 · on Thursday, 2022-09-15· at 14:05· Liffey B Part 2 (Level 1), Convention Centre Dublin, Spencer Dock, N Wall Quay, North Wall Dublin 1, D01 T1·
summary
Starts a local cat site with python -m http.server on port 8000 then moves it to privileged port 80 (requires root), reproduces a port collision and how Docker’s iptables-based forwarding can hide collisions, deploys the same site to an EC2 public IP (54.172.187.247) over SSH, explains that NAT hides hosts so private IPs (10., 172.16–31, 192.168.) can outbound but not be reached inbound, shows iptables -P INPUT DROP and adding/removing rules, warns DNS caches (TTL up to 2 days) and poisoning, and notes DNS-only load balancing lacks health checks.
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chapters (7)
- 0:00Introduction to networking
- 6:02Understanding network ports
- 11:31IP addresses and subnets
- 26:34Private vs. public networks
- 33:45Network address translation
- 46:46DNS and domain management
- 1:00:44Firewalls and conclusions
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