How to set 20C into Transparent mode?

[AlexFeren]

I am unable to set my FWF-20C-ADSL, v5.2.4 into Transparent mode - the command system setting's opmode (Operation Mode) doesn't exist.

FW20CA3X13000939 # show full-configuration system settings | grep opmode

FW20CA3X13000939 #

but

FW20CA3X13000939 # get system status | grep Mode Operation Mode: NAT

According to KB Technical Tip: Activate Transparent Mode on FortiGate 20C and FortiGate 30D, using the CLI it did exist in FortiOS firmware version 5.0 Patch 6.

Anyone can shed some light?

[qxu_FTNT]

Changing mode is at:

config system setting

    set opmode transparent

    ...

end

[AlexFeren]

Perhaps I should have spelled it out:

FW20CA3X13000939 # config system setting FW20CA3X13000939 (settings) #  set opmode transparent command parse error before 'opmode' Command fail. Return code -61

[qxu_FTNT]

Oh, right ADSL models for 20C only supports NAT mode.

[AlexFeren]

Why? Given that system global's wan toggle allows definition of a WAN port, this ADSL model-specifc limitation is unnecessary.