Can I change MTU

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  1. Posts : 4
    Windows 7
       #1

    Can I change MTU


    Where can I change MTU to say something like 1452 - I am running PPPoE and the router is dropping packets. I get 500Mbits when connected directly to modem and 50Mbits when connected through router.

    Thanks in advance

    Anatol
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  2. Posts : 833
    Windows 7 x64 HP, Windows 7 HP, Windows 7 Ult
       #2

    anatol said:
    Where can I change MTU to say something like 1452 - I am running PPPoE and the router is dropping packets. I get 500Mbits when connected directly to modem and 50Mbits when connected through router.

    Thanks in advance

    Anatol
    Welcome to Seven Forums, anatol.

    You can change the MTU in the router. Depending on the type, the place to change it will be called different things, but look for "Setup" or "Basic setup" when you log onto the router.

    Try setting it equal to the MTU value in the modem.

    (The receive buffer value in the network interface card (NIC) will be set to a lot less - probably 256 - don't worry about that.)
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  3.   My Computer


  4. Posts : 833
    Windows 7 x64 HP, Windows 7 HP, Windows 7 Ult
       #4

    Since you don't have the problem when directly connecting to the modem, but do when you connect through the router, that tells me that the router is somehow involved.

    While it is true that the originating system has a role in the size, once it hits the Internet, the "originator" to you is the last switch in the line - your ISP.

    All that said, it is possible that the connection between your system and the router is causing problems. Is the connection wireless to the router? If it is, check for interferrence near the router - lights, monitor, etc.
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  5. Posts : 4
    Windows 7
    Thread Starter
       #5

    I am using wired connection to the router. The best explanation why MTU needs to be changed on the computer can be found at Max MTU: How do I find mine? Tweaking FAQ - dslreports.com ...
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  6. Posts : 4
    Windows 7
    Thread Starter
       #6

    The answer to my question is:
    Run netsh as Administrator

    netsh>interface ipv4
    netsh interface ipv4>show interface

    Idx Met MTU State Name
    --- ---------- ---------- ------------ ---------------------------
    1 50 4294967295 connected Loopback Pseudo-Interface 1
    11 10 1500 connected Local Area Connection

    netsh interface ipv4>set interface "Local Area Connection" mtu=1452
    Ok.
    netsh interface ipv4>show interface

    Idx Met MTU State Name
    --- ---------- ---------- ------------ ---------------------------
    1 50 4294967295 connected Loopback Pseudo-Interface 1
    11 10 1452 connected Local Area Connection

    netsh interface ipv4>bye


    Did it solve my problem - that is a different question :)
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  7. Posts : 5,747
    7600.20510 x86
       #7

    Windows 7 auto tunes. No need to adjust anything.

    Set the router back to factory settings.
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  8. Posts : 100
    Windows 7 Pro 64-bit
       #8

    torrentg said:
    Windows 7 auto tunes. No need to adjust anything.

    Set the router back to factory settings.
    Wow! Autotunes - really? So, I don't need to set the MTU to 1492 like I did in XP? That's great! One less tweak I have to do. Way to go MS.
    Last edited by RadioJoe; 07 Dec 2009 at 13:45. Reason: spelling
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  9. Posts : 5,642
    Windows 10 Pro (x64)
       #9

    Windows 7 is by default using Ethernet II which has an MTU of 1500 versus Ethernet (I or 802.3) which has an MTU of 1492. Most modern networks are using Ethernet II frames...if yours is not...well...
      My Computer


  10. Posts : 3,960
    W7 x64
       #10

    For all of it's whistles and bells, Windows 7 support for ethernet devices lags far, far, short of that of Windows XP - and it's by no means clear whether all the intended improvements actually add real functionality...
      My Computer


 
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