bug: jumbo frame not working when WAN port in bridge mode

Discussion in 'Tomato Firmware' started by rs232, Mar 29, 2012.

  1. rs232

    rs232 Network Guru Member

    Hi all,

    I've just installed a toastman v1.28.7497 MIPSR2-Toastman-VLAN-RT K26 USB VPN-NOCAT on a netgear 3500L. I'm using this device mainly as gigabit switch at the moment so I've disabled the WAN interface and set the flag: Bridge WAN port to primary LAN (br0)

    As I'm using gigethernet and have jumboframes enabled throughout the network I've enabled jumbo frames on this device too.

    It does work (I'm pinging from windows with "-l 8900 -f" parameters) when I'm using any of the LAN ports on the router but jumboframes fails when I'm plugged to the WAN port.

    NOTE: when it fails I don't really get the usual MTU error message message about "segmentation needed but no fragmentation is specified in the ping command". It just gives back a "Request timeout". Reducing the length to e.g. 1400 it works perfectly fine.

    Last note: I can confirm that my laptop is indeed connected at 1gb (autonegotiated) when plugged to the WAN port.

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