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    --- title: Lab Meeting Minutes 2020/12/29 tags: lab_meeting --- >Outline >[TOC] --- # PERAL Lab Meeting - 時間:109年12月29日14:00 - 地點:暨南大學科三館321教室 - 出席者:吳坤熹老師、謝萬霖、陳嘉瑋、劉怡君、田蕙瑜、劉又聖 - 會議主題: 期末專題報告 Rehearsal (1) - 主講者: 陳嘉瑋、田蕙瑜、劉怡君、劉又聖 - 主記: 陳嘉瑋 ## 會議內容 ### The Study of Cost/Performance ... > [name= Pheobe] #### VM vs container - VM 需要自己的 OS,container 不用 - 移植性 container 較優 #### Container - Linux container (LXC) - Docker - 跨平台 #### Future work - DDoS attack - Performance measure - LXC: `lxc-info` - docker: `docker stat` - linux: `htop` - Kubernetes ### 臺灣學術網路中廣播封包對效能之影響分析與增設VLAN之改進芻議 > [name= Jeffery] #### 動機 - 廣播封包占 vlan 21 57% 的封包數 #### 架構 - 跨 vlan 溝通需要透過 router - DHCP 的請求會出現問題 - 兩邊 network ID 一樣的問題 - router 啟用 NAT、DHCP - NAT 外部與內部溝通問題 - 改用 proxy server - server 代為取得學校的 IP 位址 #### 進度 - 架構構思 - vlan 原理 - DHCP 原理 - NAT 原理 - 實作 vlan 間溝通 - iperf #### 規劃 - proxy server 的架設 - 效能量測 ### ... > Angela #### SIP - SIP call example - SIP forking example #### 醫療機構的護理站情境 - 移動護理站狀況 ### ... > [name= Johnson] #### Attack 種類 - High-rate vs Low-rate attack - Low-rate 比較不容易被偵測 #### Low-rate 手法 - Slow header - Slow body #### 現行防禦機制 - Apache2 參數 - Nginx 參數 #### Testing tool - SlowHTTPTest - DoS 攻擊 - 提供多種模組 - 有圖表輸出 #### 實際攻擊測試 - Apache2 server 的狀況 - 解決方案 - Python socket server #### 待解決問題 - 受害者和攻擊者在同NAT #### 建議&問題 ##### Phoebe 1. 不同的 VM host 做的量測可能只會證明那個 container 跟這個 OS 比較合 [name= Solomon] Ans: 待處理 2. 可移植性比較好是指什麼? [name= Angela] Ans: 因為 VM 需要完整的作業系統,container 則是用 host 的作業系統,所以 container 相對容易分享。[name= Phoebe] Ans: 可以把image大小、boot up時間 等數值補上,讓聽眾比較有感覺。[name= Solomon] 3. 建議可以看一下[這個影片](https://www.youtube.com/watch?v=8fi7uSYlOdc) [name= Edgar] 4. 為什麼要用 container 做 DDoS? [name= Solomon] Ans: 預測 container 在實現多方來源進行攻擊的CP值較高。 硬體上的極限;邏輯上的可行;便於建置不會是 DDoS 的必要元素。重點在CP值! [name= Solomon] 5. DDoS的D? [name= Edgar] Ans: 多台container邏輯上IP address不同即可實現 [name= Solomon] ##### Jeffery 1. 架構 1 的第一個敘述是一個問題嗎? [name= Pheobe] Ans: 這是一個狀況,會再修正投影片。[name= Jeffery] 2. APR proxy 是否就可以解決 router 兩邊 network ID 相同的問題了? [name= Pheobe] 3. 架構 3 有想過要怎麼進行了嗎? [name= Edgar] 4. 架構 3 的 proxy server 會不會被誤會成 http proxy? [name= Solomon] Ans: 這個 proxy server 可能有其他專有名詞,或是在這邊要更換敘述。 [name= Solomon] 5. 需要說明 NAT 和 NAPT 的不同? [name= Solomon] 6. 不要講投影片上面沒有的東西,會讓聽眾無法 follow。如果不講會更順的話,那就把投影片放到 backup slide。 [name= Solomon] 7. 研究一個問題時最重要的是 Why。技術細節太多,動機很重要。 [name= Solomon] 8. 建議題目 [name= Solomon] - 引進 TRIAL 這個通信協定到實驗室,讓機器不管在哪個 subnet 都可以正常運作 - network function virtualization of DHCP 9. [DHCP base on NFV](https://www.fusionlayer.com/products/dhcp-server-software-appliance) 貌似有人做了,可以看看 [name=Johnson] ##### Angela 1. 所以你是想要透過這個系統將總機換成這個系統? [name= Johnson] Ans: 2. 移動護理站是不存在的東西嗎? [name= Phoebe] Ans: 目前還沒有。 [name= Angela] ##### Johnson 1. 有了 Nginx 防護的時候,為什麼還要提出自己的方法? [name=] 2. 補上一般Python Server沒有防護的樣子,接續到後面兩張圖的轉折 ## 待追蹤事項 1. [name=] ## 臨時動議 - 無 --- 散會結束時間:16:40

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