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Thread: Change MTU size of W2k3

  1. #1
    David Guest

    Change MTU size of W2k3

    Hi

    Anyone knows that how to change MTU size of W2k3? by edit registry? Any
    tools?

    Thx



  2. #2
    Jerold Schulman Guest

    Re: Change MTU size of W2k3

    On Sat, 20 Aug 2005 10:07:01 +0800, "David" <logintck@yahoo.com> wrote:

    >Hi
    >
    >Anyone knows that how to change MTU size of W2k3? by edit registry? Any
    >tools?
    >
    >Thx
    >

    http://support.microsoft.com?kbid=900926 "Recommended TCP/IP settings for WAN links with a MTU size of less than 576 "
    http://support.microsoft.com?kbid=826159 "HOW TO: Change the Default Maximum Transmission Unit {MTU} Size Settings for PPP Connections or for VPN Connections "
    http://support.microsoft.com?kbid=159211 "Diagnoses and Treatment of Black Hole Routers "
    http://support.microsoft.com?kbid=179442 "How to configure a firewall for domains and trusts "
    http://support.microsoft.com?kbid=229064 "Load Balancing may not work correctly with IP fragmentation in Windows Server 2003 in Windows 2000 and in Windows NT "
    http://support.microsoft.com?kbid=324270 "How to harden the TCP/IP stack against Denial of Service Attacks in Windows Server 2003 "
    http://support.microsoft.com?kbid=325449 "How to install and configure IP version 6 in Windows Server 2003 Enterprise Server "
    http://support.microsoft.com?kbid=883389 "How to reduce the EAP packet size by using the Framed MTU attribute in Windows Server 2003 "
    http://support.microsoft.com?kbid=893066 "MS05-019: Vulnerabilities in TCP/IP could allow remote code execution and denial of service "
    http://support.microsoft.com?kbid=898060 "Installing security update MS05-019 or Windows Server 2003 Service Pack 1 may cause network connectivity between clients and servers to fail "


  3. #3
    Join Date
    Jul 2011
    Posts
    330

    Re: Change MTU size of W2k3

    Just run MS05-019 security update. This would help you to get a proper output as per your need. This update will make required changes in the OS. Later on Windows will be able to validate ICP request. This update usually restrict the MTU size to 576byte. This is done to avoid ICMP attacks. It is essential for the security purpose. But this also affect some networks. Network connectivity may drop in some case. For fixing the issue you can go ahead with using a Network monitor software. this tool will give you a detailed analyses of your network.

  4. #4
    Join Date
    Jul 2011
    Posts
    419

    Re: Change MTU size of W2k3

    You can try setting the MTU size manually. You can do that through simple settings. For that you will need to modify the system registry. To fix the same press Start + R from the keyboard. This will launch run box. In that you have to load registry editor. Type regedit and hit OK. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<ID for network interface>. You have to click on Edit menu in it and then choose New > DWord Value. In this type MTU and enter. Once again to Edit > Modify > Value > MTU > OK. Restart your pc to see effect.

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