Who am I ?

Denny Huang

• SITCON 2013, 2014 總召

• Rayark Inc.

• About me

WSL

Kenny Huang, Ph.D. 黃勝雄 博士

• 網路之根 – 基礎建設與標準化

• SITCON 2017 - Cybersecurity and Internet Governance 網路安全與網路治理

History of the Internet

OSI

7?

IETF/RFC

RFC 2324

RFC 2468

Network Interface

Predictable Network Interface Names

Ask the man

man [command]

IP

Public IP / Private IP

ip a

Port

ARP

arp / ip neighbour

Gateway / Netmask

ip route / route / traceroute / mtr

TCP / UDP

nc -lvp [port] / nc -v [hostname/ip] [port]

nc -lvup [port] / nc -vu [hostname/ip] [port]

Three-Way Handshake

tcpdump -X host [ip]

DNS

dig / nslookup

HTTP

request method / status code / headers

Response a web page

Server

nc -lvp 8000

HTTP/1.1 200 OK[Enter]
[Enter]
Hello
^C

Clint

• Browser
• curl -v localhost:8000

Python 3 HTTP Server

Start Server

python3 -m http.server

Request with

• nc -v 0 8000
  • GET / HTTP/1.1
• curl -v localhost:8000
• Browser

HTTPS

Cookie / Session

How Browsers Work?

API

Application Programming Interface

政府資料開放平台 / 台北市資料大平台

JSON

Example

jq / JSON Viewer / JSONView

RESTful

Web crawler / bot

Q & A

延伸閱讀

• 從 0 開始的 Web Security

Thanks for listening!

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