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    if_pppoe: Is PPPoE MRU/MTU auto-negotiation not supported?

    Scheduled Pinned Locked Moved General pfSense Questions
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    • A Offline
      azalea
      last edited by

      pfSense does not set MTU correctly when "if_pppoe" is enabled.(2.8.0-RELEASE)

      My ISP's PPPoE specification is MRU/MTU=1454.
      The MTU setting for pfSense is blank.

      if_pppoe enabled:
      The interface status shows MTU as 1492.
      The ppp status log shows nothing.

      if_pppoe disabled(mpd5):
      The interface status shows the MTU as 1454.
      The ppp status log shows that during MRU/MTU auto-negotiation, pfSense received "Configure Request MRU=1454" from the ISP and that pfSense sent "ConfigAck MRU=1454" to the ISP. It also shows that pfSense sent "ConfigReq MRU=1492" to the ISP and that pfSense received "Configure Ack MRU=1492" from the ISP.

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      • stephenw10S Offline
        stephenw10 Netgate Administrator
        last edited by

        Hmm, interesting question! I don't think I've ever seen an ISP that supported/required that.

        I assume it works as expected if you set the MTU manually?

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