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Changing MTU on the gui does nothing

Scheduled Pinned Locked Moved webGUI
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  • F Offline
    fernandodx 0
    last edited by May 15, 2019, 7:35 PM

    Hello,

    I tried this on pfSense 2.4.4-RELEASE-p2, did a fresh install too to make sure it isn't a config issue, but there is something strange showing up on my install

    On the interfaces / WAN, there are two fields: MTU and MSS

    I tested the changes using this site: www.speedguide.net/analyzer.php

    I changed MTU to 1440, visit speedguide and nothing happens

    BUT if I change MSS to 1440, on speedguide the MTU field shows correctly, and MSS as 1400

    Is this a bug or I am understanding it all wrong?

    Thanks, have a nice day.

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    • J Offline
      johnpoz LAYER 8 Global Moderator
      last edited by johnpoz May 15, 2019, 7:48 PM May 15, 2019, 7:40 PM

      @fernandodx-0 said in Changing MTU on the gui does nothing:

      understanding it all wrong

      Ding Ding Ding - you win yourself a cookie ;)

      Google mtu vs mss

      An intelligent man is sometimes forced to be drunk to spend time with his fools
      If you get confused: Listen to the Music Play
      Please don't Chat/PM me for help, unless mod related
      SG-4860 25.07 | Lab VMs 2.8, 25.07

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      • F Offline
        fernandodx 0
        last edited by May 16, 2019, 2:56 PM

        Please enlighten me in one detail

        If I leave MTU on default, and on my Desktop Ubuntu I change my NIC mtu to 1440, speedguide shows the value I entered

        I revert my Desktop NIC to 1500, and change pfsense MTU on the WAN interface to 1440, no changes are seem on speedguide

        But if i change the MSS value of the WAN interface on pfSense, them the MTU value changes to 1440 on speedguide

        399f5df7-1524-4ea9-a235-54f8ab802482-image.png

        feedec90-cbf4-4921-82d3-e8122cba164e-image.png

        Why changing the MTU field on the gui din't show on speedguide, but MSS did actually reflect the value I entered for MTU?

        Thanks!

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        • J Offline
          johnpoz LAYER 8 Global Moderator
          last edited by May 16, 2019, 3:11 PM

          Because they are completely different things.. Again google mtu vs mss..

          An intelligent man is sometimes forced to be drunk to spend time with his fools
          If you get confused: Listen to the Music Play
          Please don't Chat/PM me for help, unless mod related
          SG-4860 25.07 | Lab VMs 2.8, 25.07

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