Jumbo Frames

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  • #16897
    kev2021
    Participant
    • Posts 262
    • Regular

    Hi all,

    Been looking into the speed of my network a little and I came across people suggesting to enable Jumbo frames on the switch and on devices.

    Now, is there a easy way to determine if all wired devices support jumbo frames? I.e. is there a tool which will scan my network and show what is and isn’t jumbo frames compatible?

    If I was to enable jumbo frames, what would happen if a deice wasn’t capable of jumbo frames? Would it drop off the network and be unreachable or when using it, it simply would fail to connect to the network?

    Does it affect wireless devices too or just wired? I presume just wired?

    My HP 1810G switch is capable of jumbo frames but it seems it has to be set for the whole switch, doesn’t look like I can enable it on certain ports.  My NAS I’m sure is capable of jumbo frames and i’ pretty sure my desktop PC;s will be but I have other devices like appletv, smart plugs, TV’s, media streamers which I have no idea if they are capable or not so unsure how I tell without having to go round writing down all the devices info and looking them all up 1 by 1 :(

    Thanks

    Kev

    #16901
    UK Sentinel
    Moderator
    • Posts 4233
    • Skipper

    Jumbo Frames in iSCSi network is very useful and can increase Ethernet LAN Network efficiency by up to 20%

    Jumbo frames is not supported on Wireless as wifi only supports MTU of 2304 bytes.

    The easiest (cheapest)  way to test a LAN for Jumbo Frames support is via ping command with a stated payload packet size. (see below)

    https://serverfault.com/questions/234311/testing-whether-jumbo-frames-are-actually-working

    Regarding Using Jumbo Frames, if a device does not support Jumbo Frames (TV) , then the packet usually will be Fragmented adding addition load to NIC or Switch etc.

    But this is a little more blurred, as such devices, may not work as well, at all, alas trial and error will be required.

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #16913
    kev2021
    Participant
    • Posts 262
    • Regular

    think I’ll leave jumbo frames off, bound to be something that doesn’t work :)

    Kev

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