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    Changing MTU on the gui does nothing

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    • F
      fernandodx 0
      last edited by

      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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      • johnpozJ
        johnpoz LAYER 8 Global Moderator
        last edited by johnpoz

        @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 24.11 | Lab VMs 2.7.2, 24.11

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        • F
          fernandodx 0
          last edited by

          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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          • johnpozJ
            johnpoz LAYER 8 Global Moderator
            last edited by

            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 24.11 | Lab VMs 2.7.2, 24.11

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