RUTM08 - Override MTU limited to 2030 in WebUI, but Wiki says [98..65535]

Networking Solutions Question
1

Device: RUTM08
Firmware: RUTM_R_00.07.22.1

I need Jumbo Frames (9000 bytes) end-to-end through the router. My TSW212 switches already forward jumbo frames fine (max_pkt_len=10000, confirmed working per this thread: TSW212 jumbo frames? ).

On my RUTM08 (fw 00.07.22.1), the WebUI’s “Override MTU” field (Network → LAN → any interface → Advanced Settings) rejects anything above 2030:
“Value must be an integer and range of the value must be from 68 to 2030.”

However, the official wiki (documented against fw 00.07.24.1) states:
“Override MTU | integer [98..65535]; default: none”
( RUTM08 LAN - Teltonika Networks Wiki )

Questions:

  1. Was the MTU range widened between 00.07.22.1 and 00.07.24.1, or is 2030 a bug in my current firmware?
  2. If I update to 00.07.24.1 (or later), can I expect 9000 to actually work end-to-end, or is 65535 just the form’s accepted range without guaranteeing real hardware support at that size?
  3. Is there a UCI workaround to set 9000 on the current firmware without updating (e.g. explicit config device on eth0)?

Thanks.

2

On RUTM08 with RUTM_R_00.07.24 (but i believe that on previous versions also) Override MTU for values over 2030 is possible only if you bridge interfaces in Physical Settings of said interface.

Hope that helps.