c:\powershell
c:\Set-VpnConnectionIPsecConfiguration -ConnectionName "OFFICE-VPN" -AuthenticationTransformConstants SHA196 -CipherTransformConstants AES256 -EncryptionMethod AES256 -IntegrityCheckMethod SHA1 -PfsGroup None -DHGroup Group14 -Force 
c:\Set-VpnConnection -Name "OFFICE-VPN" -TunnelType "L2tp" -EncryptionLevel "Optional" -AuthenticationMethod Chap -SplitTunneling $False -RememberCredential $True -PassThru