用於封包監控之HDLC與乙太網協定的訊框轉換器

FRAME CONVERTER FROM HDLC TO ETHERNET FOR PACKET MONITORING

查冠宇(Kuan-Yu Cha)

指導教授 ： 陳建華

大同大學/電機資訊學院/通訊工程研究所/碩士(2010年)

摘要

針對以E1訊框傳輸HDLC IP封包的運用，大部份量測設備都著重在E1協定層級的分析。基於E1 HDLC在IP封包上監控的需求及成本考量，本論文研究實現E1 HDLC IP至Ethernet IP的設計，轉換後的封包可利用Wireshark軟體或Ethernet分析設備監看，以大幅降低投資在設備的成本。 本論文透過由E1 HDLC路由器連接2個Ethernet IP網段建立的模擬網路，實作「E1介面擷取」、「路由器轉換」與「嵌入式Linux網路設備轉換」等三種HDLC IP監控架構，並說明設定方式、測試步驟與結果。在實驗過程中，發現ARP對路由器轉換的限制及提出解決方案，並確認嵌入式Linux網路設備轉換的可行性，達成提升IP封包監控能力之目的。最後本論文綜合分析三種監控架構特性，做為E1 HDLC 在IP封包監控應用之參考。

關鍵字

路由器 ； 乙太網 ； 網際網路協定 ； 高階資料鏈結控制 ； 嵌入式 ； 封包監控

並列摘要

When E1 lines are used for HDLC IP communication, most monitoring equipments are usually restricted to analyze the E1 frames. To answer the need for E1 HDLC IP packet monitoring and to reduce its cost, we tried to find a way to convert the E1 HDLC IP packets to the Ethernet IP packets, which can then be easily analyzed with software such as Wireshark or Ethernet protocol analyzers.
We implements three HDLC IP monitoring structures: E1 interface capturer, router-based converter, and embedded Linux converter. Each approach was tested in our experimental network, which includes an E1 HDLC router connecting two Ethernet IP network segments. For each approach, we discussed in details the setup process, testing procedures, and the experimental results. In the experiment, we discovered the effect of ARP on router-based converter, and we proposed a solution. We also confirmed the viability of embedded Linux converter, which achieves the goals of cost-reduction and packet monitoring. Finally we provide an overall analysis of three approaches for future study of E1 HDLC IP packet monitoring.

並列關鍵字

router ； ARP ； Ethernet ； IP ； HDLC ； E1 ； embedded Linux ； packet monitoring

參考文獻

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