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Wednesday 04th of May 2016

Category: Network-Tools/Network-Information

Simple MTU Test 1.0c

Author: Kevin Ottalini
Operation System: Windows XP / 2003 / Vista / XP X64 / Vista64 / 7 / 7 x64
Size: 131 KB
Date: 2010-12-23

MTU stands for Maximum Transmission Unit or Maximum Transfer Unit the largest physical packet size measured in bytes that a network can transmit. For example, an Ethernet MTU is 1500 bytes.Packets that are longer than the MTU must be divided or fragmented into smaller frames. The layer 3 network protocol, typically IP, extracts the MTU from the layer 2 data link protocol such as Ethernet and fragments the messages into that frame size so that they can travel over the lower layer. Every network has a different MTU, which is typically set by the network administrator or has a default Value set when the operating system was installed. On Windows 95/98/XP/Vista you can set the MTU of your machine for best performance although typically the default of 1500 is usually the best. Changing network properties for VISTA is not recommended at this time since the defaults appear to do a pretty good job already.Ideally, you want the MTU to be the same as the smallest MTU of all the networks between your machine and a message's final destination, otherwise, if your messages are larger than one of the intervening MTUs, they will get broken up (fragmented), which slows down transmission speeds. Trial and error is the only sure way of finding the optimal MTU, but there are some guidelines that can help. For example, the MTU of many PPP connections is 576, so if you connect to the Internet via PPP, you might want to set your machine's MTU to 576 too.NOTE: 28 bytes need to be added to the Discovery value since this tool discovers the ping (ICMP) packet size which doesn't include the 28-byte TCP/IP header. IE: 28 is the sum of IP and ICMP headers, 48 is the sum of IP, TCP and PPPoE headers. Normally you should never need to change the MTU size but it doesn't hurt to check since some application may have tweaked it. This little tool will scan a range of packet sizes and display the maximum size that won't fragment as well as your current MTU setting in the registry.MtuTest uses your operating system native Ping application to do all the work, it basically just automates the manual discovery process and prepares a report. MtuTest does not change your MTU, it only discovers and displays the results.  Requirements:

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