Can you find what the maximum transmission unit (mtu) a tcp/ip will sustain. answer there are many applications and hardware that do not conform to the normal mtu of 1500 for tcp/ip actual packet size is lower [1472] due to header information.. Hi guys, i had a question regarding the ping tool and mtu size. lets say i ping www.google.com and i am trying to ping it with say 2000bytes of data, it fails.. Determining the correct mtu size ii. setting up the correct mtu size determining the correct mtu size. to determine the correct mtu size for your network, you’ll have to do a specific ping test on the destination you’re trying to go to like using another computer or a web address..
How to determine the proper mtu size with icmp pings. to find the proper mtu size, you have to run a special ping to the destination address. this is usually the gateway, local server or an ip address domain name internet (e.g. thepacketwizard.com).. Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. add 28 to that number (ip/icmp headers) to get the optimal mtu setting. for example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal mtu setting.. Tcp data size (mss) when mtu is 1500 and not using pppoe. 1464 the maximum ping data payload before fragmentation errors are received when using a pppoe-connected machine..