WRV54G F/W 2.37 Breaks the MTU size

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by binderz77, Jul 26, 2006.

  1. binderz77

    binderz77 Network Guru Member

    With the Firmware 2.37 WRV54G has set the Default MTU size to be 576 and this made my video phone to not work. Can anyone throw more light on this?
  2. Toxic

    Toxic Administrator Staff Member

    tbh you MTU needs to be setup with your ISP connection. usually Cablemodems use 1500, ADSL use 1492

    576 would be incompatable and may not be supported by the video phones own software.
  3. binderz77

    binderz77 Network Guru Member

    My ISP is Comcast and they set it as 1500. But when WRV54G sends the DHCP discover it requests for among other things, the MTU size and when the cable modem does not respond to that request, it sets itself to 576.

    Then I set it to manual value of 1500 to get it work as my videophone would not work with fragmented packets
  4. TazUk

    TazUk Network Guru Member

    Really you should be using the 2.39.2 firmware as the one your using is pretty old :eek:
  5. Toxic

    Toxic Administrator Staff Member

  6. binderz77

    binderz77 Network Guru Member

    The new firmware ( 2.39.2 ) has the same behavior. F/W 2.36 works good though. Anyways I put on the new firmware and set the MTU to manual and now everything is working fine.

    Thanks for all the input guys...


    Linksys: WRV54G, WRT54GXv1, WRT54GX2, WRT54GX4, RV041
    Dlink : DGL-4300, DGL-4100
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