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Homework 3

Homework 3. NAT (1/9). Network Address Translation Convert IP Address and port between private and public realm Works on network layer and transport layer. NAT (2/9). NAT. A. B. 192.168.0.10. 163.13.128.5. 140.112.30.8. NAT (3/9). NAT. A. B. Port:1234. 192.168.0.10. 163.13.128.5.

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Homework 3

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  1. Homework 3

  2. NAT (1/9) • Network Address Translation • Convert IP Address and port between private and public realm • Works on network layer and transport layer

  3. NAT (2/9) NAT A B 192.168.0.10 163.13.128.5 140.112.30.8

  4. NAT (3/9) NAT A B Port:1234 192.168.0.10 163.13.128.5 140.112.30.8

  5. NAT (4/9) NAT A B Port:5678 Port:1234 192.168.0.10 163.13.128.5 140.112.30.8

  6. NAT (5/9) NAT A B Port:5678 Port:5555 Port:1234 192.168.0.10 163.13.128.5 140.112.30.8

  7. NAT (6/9) NAT A B 192.168.0.10 163.13.128.5 140.112.30.8

  8. NAT (7/9) NAT A B Port:5678 Port:5555 192.168.0.10 163.13.128.5 140.112.30.8

  9. NAT (8/9) NAT A B Port:5678 Port:5555 192.168.0.10 163.13.128.5 140.112.30.8

  10. NAT (9/9) NAT A B Port:5678 Port:5555 Port:1234 192.168.0.10 163.13.128.5 140.112.30.8

  11. Types of NAT • Full Cone NAT • Restricted Cone NAT • Port-Restricted Cone NAT • Symmetric NAT

  12. Binding Life Time of NAT (1/4) • When a client sends a UDP packet to public Internet, NAT will allocate a public port for the private address and port • If no UDP traffic on the public port for a period, NAT will release the public port • The period is “binding life time”

  13. Binding Life Time of NAT (2/4) Client use privet port to send a UDP packet to public server NAT Client Server Port:1234 192.168.0.10 163.13.120.90 140.112.30.80

  14. Binding Life Time of NAT (3/4) NAT will allocate a public port for 192.168.0.10:1234 NAT Client Server Port:1234 Port:5555 192.168.0.10 163.13.120.90 140.112.30.80

  15. Binding Life Time of NAT (4/4) If no UDP traffic on the public port for a period, NAT will release the public port NAT Client Server Port:1234 Port:5555 192.168.0.10 163.13.120.90 140.112.30.80

  16. Homework 3 • 了解前述四種類型NAT之運作方式與差異 • 設計測試NAT類型與Binding Life Time的方法並實作

  17. 測試環境-R219 PC Internet PC Full Cone NAT Public IP PC PC Public IP Public IP Port-Restricted Cone NAT Restricted Cone NAT Private IP PC PC PC PC PC PC PC PC

  18. 測試用NAT

  19. 評分標準 • 書面報告 (共25%) • 解釋四種類型NAT的運作方式 • 測試方法與架構 (須寫出詳細流程) • 流程圖 • 程式&Demo (共65%) • 是否位於NAT下 (5%) • Binding Life Time (10%) • Full Cone NAT (15%) • Restricted Cone NAT (15%) • Port Restricted Cone NAT (15%) • Symmetric NAT (5%)

  20. 注意事項 (1/2) • 本次作業所有測試均是針對UDP • 本次作業兩個人一組 • 書面報告字數需1500字以上 • 書面報告須寫上中文姓名與學號,未寫者各扣2分 • 書面報告電子檔請繳交.doc或.pdf檔 • Binding Life Time的誤差必須在10秒以內 • 可以使用任何程式語言

  21. 注意事項 (2/2) • Demo時當場以截止繳交日期前寄出的source code編譯執行檔 • 執行環境以R219電腦中可提供的為主,如使用特殊的Compiler,請自行準備執行環境 • 作業驗收標準以可在R219之電腦執行為準,若Demo時程式無法於 R219之電腦執行,則視同作業未完成 • 作業請勿抄襲 • Demo 時請攜帶書面報告紙本,並於封面註明中文姓名與學號 • 每組 Demo 時間為15分鐘,必須於時間內完成四種NAT與Binding Life Time的測試,逾時未測試完畢的部份不予計分 • Demo時所使用的NAT, Binding Life Time均小於5分鐘 • 作業三最高分90分 (Term-Project才有可能得到高於90分)

  22. 繳交日期 • 95年6月24日 24:00 前 • 於截止時間前將Source Code與書面報告寄至network2006@csie.ntu.edu.tw • Demo地點 : R219 • Demo時段 : 6/29 , 6/30 • 請於Demo前一週至R442門口填表預約時段 • 繳交格式 • Source Code檔名 : 學號1_學號2.副檔名 • 書面報告檔名 : hw3_學號1_中文姓名1_學號2_中文姓名2.副檔名 • 信件標題格式 : hw3_學號1_中文姓名1_學號2_中文姓名2 • 未依上述格式繳交者各扣2分

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