TCP/IP Optimizer can help you to optimize Dialup, DSL and Cable all from one simple to use interface. (It has the option to return your Registry to its default untweaked state as well) It also includes built in MaxMTU and Latency(Ping) detection utilities.

The program can aid both the novice and the advanced user in tweaking related TCP/IP parameters in the Windows Registry, making it easy to tune your system to the type of Internet connection used. The tool uses advanced algorithms, and the bandwidth*delay product to find the best TCP Window for your specific connection speed. It provides for easy tuning of all related TCP/IP parameters, such as MTU, RWIN, and even advanced ones like QoS and ToS/Diffserv prioritization. The program works with all current versions of Windows, and includes additional tools, such as testing average latency over multiple hosts, and finding the largest possible packet size (MTU).

The TCP Optimizer is targeted towards broadband internet connections, however it can be helpful with tuning any internet connection type, from dialup to Gigabit+ :)

The SG TCP Optimizer provides an intuitive interface for tuning and optimizing your Internet connection. The tool helps easily find the best MTU and RWIN values, test latency, and tweak all the significant broadband related registry parameters. The Optimizer supports tuning any Internet connection type, from Dialup, Cable, Satellite, and DSL to commercial-leased lines. It creates automatic backup of all parameters, for easy reversal of the changes as well.

The license of this software is Freeware, you can free download and free use this ip utility software.