TCP Server Test Tool and TCP Client Test Tool

One might assume that open source operating systems, such as Linux and FreeBSD, with their presumably stable implementations of the standard suite of network protocols, would address all application needs; so there should be no requirement for a developer to create a new TCP/IP stack.

Yet developers often need to customize or optimize their own implementations to serve specific purposes. When that occurs, it is important to engage in thorough TCP testing to assure that all functions of the protocol continue to operate. This means testing TCP conformance, compliance, and robustness / vulnerabilities in the face of attacks.

TCP Connection Diagnostics

Some TCP test tools are limited to initiating and capturing TCP packets from one device to another for debugging TCP session connectivity issues. This is a limited task that is not TCP testing, but rather a “capture and replay” tool; Wire shark is a popular choice.

TCP Socket Testing

Many free tools exist under the “TCP socket test” category — their whole purpose is to aid application developers; they are only a little more useful than telnet clients and echo servers. They provide almost no TCP stack test value (other than “fair weather” testing.)

Network utilities establishing a TCP connection between two nodes to exchange messages is of course essential to assure basic functionality of a new implementation in both client and server roles. The network traffic exchange could be captured and manually reviewed to examine the traffic exchange between various network services, firewalls, etc. However, this is not a TCP test tool, in that there is no definition of a test, expected outcome, or source of authority. Instead it is a diagnostic or inspection tool to allow one to probe and examine the traffic stream; it requires expert TCP knowledge on the part of the user.

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