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How do i change my mtu setting? - Microsoft Windows Vista Ultimate Edition

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Use this site for a complete optimization
OR connect to your router and config it using advanced wan settings

Posted on Jan 11, 2009

  • Pat Batta
    Pat Batta Jan 11, 2009

    from a search on same link:
    You need to run and elevated command prompt. Click Start > All Programs > Accessories, right-click Command Prompt and Run as administrator, Allow it to have administrator privileges, otherwise it won't work.

    Then type/copy & paste the following command:
    netsh interface ipv4 set subinterface "Local Area Connection" mtu=xxxx store=persistent

    Where xxxx
    = the MTU that you want. Rebooting isn't required. "Local Area
    Connection" is a common name for the interface if you use a NIC for
    connectivity. A wireless NIC may be called "Wireless Network
    Connection". If unsure, the network status icon by the clock will tell
    you.

    If you have a router, ensure that the MTU is set to the MTU chosen here (refer to your router's manual).

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Increasing Speed of Internet Using MTU settings in xp


Increasing Speed of Internet Using mtu settings in Windows XP:
Maximum Transmission Unit (MTU) refers to the size (in bytes) of the largest packet that a given layer of a communications protocol can pass onwards. MTU parameters usually appear in association with a communications interface. The MTU may be fixed by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-to-point serial links). A higher MTU brings higher bandwidth efficiency.

Maximum Transmission Unit (MTU) refers to the size (in bytes) of the largest packet that a given layer of a communications protocol can pass onwards. MTU parameters usually appear in association with a communications interface. The MTU may be fixed by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-to-point serial links). A higher MTU brings higher bandwidth efficiency.

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Modify the MTU size requires registry editing in windows xp
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To modify the PPPoE MTU size, create the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ndiswan\Parameters\Protocols\0
Then add the following registry entries.Entry name Data type Value data
ProtocolType REG_DWORD 0x00000800
PPPProtocolType REG_DWORD 0x00000021
ProtocolMTU REG_DWORD the appropriate MTU size (in decimal)

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following key in the registry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ndiswan\Parameters
3. On the Edit menu, point to New, and then click Key.
4. Type Protocols, and then press ENTER.
5. On the Edit menu, point to New, and then click Key.
6. Type 0, and then press ENTER.
7. On the Edit menu, point to New, and then click DWORD Value.
8. Type ProtocolType, and then press ENTER.
9. On the Edit menu, click Modify.
10. Type 800, and then click OK.

11. On the Edit menu, point to New, and then click DWORD Value.

12. Type PPPProtocolType, and then press ENTER.

13. On the Edit menu, click Modify.
14. Type 21, and then click OK.

15. On the Edit menu, point to New, and then click DWORD Value.

16. Type ProtocolMTU, and then press ENTER.
17. On the Edit menu, click Modify.

18. Type the appropriate MTU size (decimal value), and then click OK.

19. Quit Registry Editor.
Restart the computer for the changes to take effect

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LinkedIn tanks at log in w/ Windows Vista, fine with prior operating systems


I found a solution for *my* problem, by shrinking the MTU in my router.

I have two Vista PCs at home that can't access LinkedIn's sign-in page.

I was suspicious that several browsers seemed to be having a problem, which made me think it was either a virus middleman in the network code, or a router problem. I eliminated the virus possibility by replicating the problem on another PC.

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1 Answer

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I personally have never known that changing the MTU setting can speed up your connection, as the MTU is the maximum transmition units that is sent to your pc from each web site and if the MTU setting is incorrect then some web sites will not load on your explorer page, the speed at which you download the page will not make any difference.

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See these details posted on the netgear site, and you'll notice there is no mention of speed:-

Details About MTU
A packet sent to a device larger than its MTU is broken into pieces. Ideally, MTU would be set to the same — large — value on all your computers, routers and switches, as well as on all the parts of the Internet that you access. But you cannot control the MTU on the Internet, and in practice the optimum MTU size on your LAN is related to your hardware, software, wireless interference, etc.
  • Tweaking MTU size may work well in one situation, but cause performance and connection problems in others.
  • When network devices with different MTU settings communicate, packets are fragmented to accommodate the one with the smallest MTU.
  • Windows XP sets MTU automatically, that is, it optimizes computer MTU for you. This Microsoft article explains resolving lack of connection to a broadband ISP using Windows XP: How-To Configure Broadband Connections Using PPPoE.
  • Once a network device fragments a packet, the data stays fragmented until arriving at the destination computer.
Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size:
  • 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches.
  • 1492. The size PPPoE prefers.
  • 1472. Maximum size to use for pinging. (Bigger packets are fragmented.)
  • 1468. The size DHCP prefers.
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