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Analyzing TCP Dumps

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Analyzing TCP dumps is very common use case when it comes to production support, since it is very useful and handy way to figure out network related issues. In this article I would like to walk you through that. Before start following this, you need to have thorough understanding of TCP/IP protocol suite[1].  To quickly recap your TCP/IP knowledge you may refer to this[2]. Also you need to have Wireshark packet sniffer tool installed in your system.

Scenario: Let’s invoke a simple currency converter web service with a sample SOAP request. Then we’ll capture the TCP dump and analyse it.

Before we start let me give you a brief introduction about TCP/IP suite. At the network layer, IP provides functions such as addressing, delivery, and datagram packaging, fragmentation and reassembly. At the transport layer, TCP and UDP are concerned with encapsulating user data and managing connections between devices. Other protocols provide routing and management functionality. Higher-layer protocols u…