Randomly laggy DSL

By carolinaboy ยท 30 replies
May 30, 2011
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  1. jobeard

    jobeard TS Ambassador Posts: 11,128   +982

    No, but all the evidence in this thread point to either
    1. your Modem/router or
    2. your ISP
    IMO, You need onsite, hands-on service.
  2. jobeard

    jobeard TS Ambassador Posts: 11,128   +982

    I notice that ping -l 732 works well
    while ping -l 800 fails

    suggest you change the MTU on your system to 732

    here's how
    If you set the MTU size for a network interface manually, this setting overrides the default MTU for the network interface. The MTU size is the maximum packet size in bytes that the transport will transmit over the underlying network.

    This method affects packets sent to all destinations and may significantly affect the performance, depending on the MTU size that you set.

    To set the MTU size for the network interface, follow these steps:

    1. Click Start, click Run, type regedit, and then click OK.
    2. Locate the following key in the registry:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<ID for network interface>
    3. On the Edit menu, point to New, and then click DWORD Value.
    4. Type MTU, and then press ENTER.
    5. On the Edit menu, click Modify.
    6. In the Value data box, type the value of the MTU size, and then click OK.
    7. Quit Registry Editor, and then restart the computer.​
  3. carolinaboy

    carolinaboy TS Rookie Topic Starter

    Done! thanks for all your help, much appreciated ill let you know if this MTU helps any.

    Quick question, Does that MTU change work with a router, and if it does do they need to change there MTU settings for it to change for them?
  4. jobeard

    jobeard TS Ambassador Posts: 11,128   +982

    yes, setting the MTU in the router enforces a common MTU to the whole lan - -
    but try it out first one one system
  5. carolinaboy

    carolinaboy TS Rookie Topic Starter

    Iv done it, Didn't help at all im going to give my ISP a call now since they won't answer my emails thanks for all your help.
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    Be sure to tell them all the things you tried and about Jobeard's tips. Just because they gave you a new modem, it doesn't mean that it is good. Have them swap it out again

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