What is mtu value

These packets are measured in octets, or eight-bit bytes. As a rule of thumb, a larger MTU size will increase bulk protocol throughput. Fewer packets with the same amount of data are processed when the MTU size is increased. However, the tradeoff is that may lead to delays in subsequent packets, resulting in lags and minimum latency. On the flip side, a smaller MTU size will result in more overhead and acknowledgements that must be sent and received.

For these reasons, you need to troubleshoot to make sure that your setting is not too high or not too low. Since every system and network is different, there are a few steps you will need to take in order to optimize your MTU size, resulting in optimum performance of your system. To begin, open your command prompt to begin what is known as the ping test. It is important to note that the brackets should be removed prior to inputting this command, the correct URL or IP being tested should be input, and the final digits should be the packet size value that is being tested.

If you are on a Mac computer, the command is slightly different. If a message is received that the packet needs to be fragmented, the test packet size can be dropped by 10 until the packet is no longer fragmented. Then, you can gradually increase the number until you find the maximum packet size that does not fragment.

At the Command Prompt window, type in the command below followed by the Enter key on your keyboard. You will now see your packets needs to be fragmented. Drop the packet size down by 10 to 20 bytes and test again.

As you can see from the test above, our packets still need to be fragmented. Now that you have the biggest packet size from the ping test, you will need to add 28 bytes. Therefore, you must add 28 to your results from the ping test. Looking for a VPN router setup? If you have any other concerns that need addressing, contact our Support team directly.

How to change hide. The simplest way to determine the optimal MTU size for your home network is through a simple ping test. This process involves sending multiple ping requests whilst gradually reducing the packet size until it no longer needs to be fragmented; this is where the messages are divided into smaller packets. This tutorial will cover accessing both the Command Prompt and Terminal, and then how to perform the ping tests themselves.

Type cmd into the field and click on OK. Type in terminal and press Enter. Type in the name of a pingable domain followed by the -f and -l switches and then a test packet size to start. In this example, we will start with Ping www.

If you receive a message saying that the packets need to be fragmented, perform the test again whilst reducing the packet size slightly. I found that is the highest I could achieve without fragmentation.

Take the size of the packet you have found to be optimal and add Now that you have added 28 to the packet size, you have found your optimal MTU size for your network. Your router may well be different and have more advanced options, allowing you to change the size. Login to your router and check the settings; you may find it hidden within the advanced settings menu. If, like me you are unable to do this, or would prefer to change the MTU size on each individual computer, here is a guide on how to achieve this through the Command Prompt.

Open a new Command Prompt window as an Administrator by searching for cmd in the search bar and right-clicking on the Command Prompt and selecting Run as Administrator.

Type in the command: netsh interface ipv4 show subinterfaces and press Enter. This will show you your interfaces and current MTU size.