Configuring the MTU size on the Sonicwall TZ 215

Step 1
Click on Network

Step 2
Click on Interfaces

Step 3
Find the x1 interface or the the interface that you would like to configure

Step 4
Click on the pen to configure the interface

Step 5
Click on Advanced

Step 6
Change the Interface MTU to the desired setting

Step 7
Click OK to save you changes