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LAN Traffic is Less Than WAN Traffic

Scheduled Pinned Locked Moved General pfSense Questions
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  • S
    simpat1zq
    last edited by Dec 27, 2005, 12:36 AM

    I was looking at the traffic graphs for the LAN and the WAN(my only 2 interfaces), and noticed that WAN Traffic Out was always about 20kbps higher than the LAN Traffic In at about 100kbps. Is this normal? And if it is normal, am I correct in assuming that it's because the LAN traffic is coming in via layer 2(switched), and the WAN traffic is leaving via layer 3(routed) so it has more overhead? And if that's the case, do the layer 3 headers really take up that much more space?

    thx

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    • B
      billm
      last edited by Dec 29, 2005, 7:35 AM

      @simpat1zq:

      I was looking at the traffic graphs for the LAN and the WAN(my only 2 interfaces), and noticed that WAN Traffic Out was always about 20kbps higher than the LAN Traffic In at about 100kbps. Is this normal? And if it is normal, am I correct in assuming that it's because the LAN traffic is coming in via layer 2(switched), and the WAN traffic is leaving via layer 3(routed) so it has more overhead? And if that's the case, do the layer 3 headers really take up that much more space?

      thx

      You need to read up on the OSI model a little more (http://en.wikipedia.org/wiki/OSI_model).  Regardless, it sounds like your WAN connection is PPPOE, this will result in another layer 3 encapsulation on top of your IP layer.  This is one of the reasons most internet pipe benchmark sites will tell you that there's about a 20% overhead on your DSL connection.

      –Bill

      PS. that 20% is NOT the same 20% that the shaper removes - keep that in mind ;)

      pfSense core developer
      blog - http://www.ucsecurity.com/
      twitter - billmarquette

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      • S
        simpat1zq
        last edited by Dec 29, 2005, 1:59 PM

        I know the OSI model pretty well(layer 4 and lower). I just wanted to see if I understood this particular situation correctly.

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