So to test for MTU of 9000, you actually need to set your ping packet size to 9000-28 = 8972. By adjusting the MTU value its possible to find the supported MTU value in the network. If the MTU value is not enables in the client side the ping output will be :

When you reach the higher limit, you will see a message like this and you will find the MTU size : > From 192.168.1.1 icmp_seq=1 Frag needed and DF set (mtu = 1500) ping: local error: Message too long, mtu=1500 My answer is based on this one for windows: answer #25165641 MTU size - Cisco Community To check L3 MTU on an interface issue sh ip int {if-number}. To check L2 MTU issue sh int {if-number} command. MTU And change connection's MTU limit

Take that value and add 28 to the value to account for the various TCP/IP headers. Eg. let's say that 1452 was the proper packet size (where you first got an ICMP reply to your ping). The actual MTU size would be 1480, which is the optimum for the network we're working with. You can read more about MTU in the respective Wikipedia article.

How to change the MTU in Windows Server 2008 & 2012 Apr 28, 2015 How to determine the proper MTU size with ICMP pings Take that value and add 28 to the value to account for the various TCP/IP headers. Eg. let's say that 1452 was the proper packet size (where you first got an ICMP reply to your ping). The actual MTU size would be 1480, which is the optimum for the network we're working with. You can read more about MTU in the respective Wikipedia article.

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When you reach the higher limit, you will see a message like this and you will find the MTU size : > From 192.168.1.1 icmp_seq=1 Frag needed and DF set (mtu = 1500) ping: local error: Message too long, mtu=1500 My answer is based on this one for windows: answer #25165641 MTU size - Cisco Community To check L3 MTU on an interface issue sh ip int {if-number}. To check L2 MTU issue sh int {if-number} command. MTU And change connection's MTU limit