þÿ# File Name:  Set-JumboFrame.ps1

# ========================================================

# Created:    March 24, 2010

# Version:    1.1

# Author:     Matthew H. Mattoon

# Website:    http://blog.allanglesit.com

# ========================================================

# Purpose:    Allows enabling/disabling of Jumbo Frames

#             settings automatically

# PreReqs:    1)  Interface must have a Static IP.

#             2)  To enable on a Hyper-V Virtual Switch

#             the Switch must not be created.

# ========================================================

# Examples:  .\set-jumboframe.ps1 <Mode> <IP>

#            .\set-jumboframe.ps1 enable 10.0.0.1

#            .\set-jumboframe.ps1 disable 10.0.0.1

#            .\set-jumboframe.ps1 verify 10.0.0.1

# ========================================================

# v1.0 > v1.1 - March 29, 2010

# 1) $FindAdapterProperties now only checks registry keys 

# for registry keys preceeded by a zero

# 2) Added color to the Write-Hosts

# ========================================================







param([string]$Mode = $(throw "Please specify enable, disable, or verify"),

[string]$IPAddress = $(Read-Host -prompt "Enter the Static IP of the NIC to work with"))



Function VerifyJumboFrames ($IpAddress,$AdapterName,$CurrentJumboPacket)

 {

  Write-Host -foregroundcolor yellow $IpAddress on $AdapterName currently has a MTU size of $CurrentJumboPacket

 }



Function EnableJumboFrames ($IpAddress,$AdapterName,$CurrentJumboPacket,$AdapterProperties)

 {

  $EnableRegJumboPacket = 9014

  $EnableCmdJumboPacket = "mtu=9000"

  Write-Host  -foregroundcolor yellow $IpAddress on $AdapterName currently has a MTU size of $CurrentJumboPacket

  Write-Host -foregroundcolor cyan Modifying netsh MTU Settings...

   netsh interface ipv4 set subinterface $AdapterName $EnableCmdJumboPacket store=persistent

  Write-Host -foregroundcolor cyan Modifying Registry MTU Settings...

   Set-ItemProperty $AdapterProperties.PSPath -name "*JumboPacket" -value $EnableRegJumboPacket

  Write-Host -foregroundcolor red Enable Completed - Reboot is Required.

 }



Function DisableJumboFrames ($IpAddress,$AdapterName,$CurrentJumboPacket,$AdapterProperties)

 {

  $DisableRegJumboPacket = 1514

  $DisableCmdJumboPacket = "mtu=1500"

  Write-Host -foregroundcolor yellow $IpAddress on $AdapterName currently has a MTU size of $CurrentJumboPacket

  Write-Host -foregroundcolor cyan Modifying Registry MTU Settings...

   Set-ItemProperty $AdapterProperties.PSPath -name "*JumboPacket" -value $DisableRegJumboPacket

  Write-Host -foregroundcolor cyan Modifying netsh MTU Settings...

   netsh interface ipv4 set subinterface $AdapterName $DisableCmdJumboPacket store=persistent

  Write-Host -foregroundcolor red Disable Completed - Reboot is Required.

 }



  $FindInterfaceIndex = gwmi win32_networkAdapterConfiguration |where {$_.IPAddress -eq $IpAddress}

  $FindInterfaceGUID = gwmi win32_networkAdapter |where {$_.Index -eq $FindInterfaceIndex.Index}

  $GUID = $FindInterfaceGUID.GUID

  $FindAdapterName = Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\$GUID\Connection"

  $AdapterName = $FindAdapterName.Name

## Legacy Code v1.0  $FindAdapterProperties = Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\*\' |where {$_.NetCfgInstanceID -eq $guid}

$FindAdapterProperties = Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0*\' |where {$_.NetCfgInstanceID -eq $guid}

  $AdapterProperties = Get-ItemProperty $FindAdapterProperties.PSPath

  $CurrentJumboPacket = $AdapterProperties."*JumboPacket"



if ($Mode -eq "enable")

 {

  EnableJumboFrames $IpAddress $AdapterName $CurrentJumboPacket $AdapterProperties

 }

elseif ($Mode -eq "disable")

 {

  DisableJumboFrames $IpAddress $AdapterName $CurrentJumboPacket $AdapterProperties

 }

elseif ($Mode -eq "verify")

 {

  VerifyJumboFrames $IpAddress $AdapterName $CurrentJumboPacket

 }