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Windows 7: MTU Limit - Test and change your connection's MTU limit


01 Jul 2010   #9
Everlong

Windows 8.1 Professional x64
 
 
MTU Limit - Test and change your connection's MTU limit

An MTU limit that is set too high can cause fragmented packets and packet loss on your connection. This tutorial will explain how to test if your MTU limit is sending fragmented packets and will explain how to find what value you should be using.

1) Open an elevated command prompt and...


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19 Jul 2010   #10
pacinitaly

windows 7 professional & ultimate 64bit laptops
 
 

thank you!


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20 Jul 2010   #11
blackroseMD1

Windows 8.1 Pro x64
 
 

Thank you so much for this...finally I can connect to Xbox Live through my tethered EVO. +Rep
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23 Jul 2010   #12
Everlong

Windows 8.1 Professional x64
 
 

Quote   Quote: Originally Posted by blackroseMD1 View Post
Thank you so much for this...finally I can connect to Xbox Live through my tethered EVO. +Rep
Happy to hear it helped
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13 Jul 2011   #13
toussaint89

Windows 7 professional
 
 
Help me plz

Ok so i know that your optimal mtu size is not suppose to be under 1400 but mine is 900 what is going on here can anyone help me
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22 Jul 2011   #14
Everlong

Windows 8.1 Professional x64
 
 

Quote   Quote: Originally Posted by toussaint89 View Post
Ok so i know that your optimal mtu size is not suppose to be under 1400 but mine is 900 what is going on here can anyone help me
Is that what you've set, or is that the default of it in Windows?
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23 Jul 2011   #15
Brimstoke

Windows Vista Ultimate 64bit
 
 

I have a D-Link DLG-4500 that allows the setting of the MTU and is set by default to 1500 (at max). My Windows interface connection was set to 1504. I used your tutorial to determine the appropriate MTU and it turned out to be 1476, with the extra 28 bytes that equals 1504. Should I decrease the value of the Windows interface to be equal to that of the router, and if not what problems could that cause?
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25 Jul 2011   #16
toussaint89

Windows 7 professional
 
 

Is that what you've set, or is that the default of it in Windows?

thats what i get when i do the mtu packet to like google and such i was trying to find my optimal through cmd prompt and i can't get above 900 or it says i have to defragment it more.
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25 Jul 2011   #17
Everlong

Windows 8.1 Professional x64
 
 

Quote   Quote: Originally Posted by Brimstoke View Post
I have a D-Link DLG-4500 that allows the setting of the MTU and is set by default to 1500 (at max). My Windows interface connection was set to 1504. I used your tutorial to determine the appropriate MTU and it turned out to be 1476, with the extra 28 bytes that equals 1504. Should I decrease the value of the Windows interface to be equal to that of the router, and if not what problems could that cause?
If it's too high then all you'll get is packet loss with your connection. Setting the correct MTU limit just offers a smoother connection. In a nutshell. You can decrease it to 1500 yea, it won't cause any problems.

Quote   Quote: Originally Posted by toussaint89 View Post
Is that what you've set, or is that the default of it in Windows?

thats what i get when i do the mtu packet to like google and such i was trying to find my optimal through cmd prompt and i can't get above 900 or it says i have to defragment it more.
What's your current setup for your connection i.e. do you use wireless, or wired connection etc?
My System SpecsSystem Spec
26 Jul 2011   #18
toussaint89

Windows 7 professional
 
 

Quote: Originally Posted by toussaint89
Is that what you've set, or is that the default of it in Windows?

thats what i get when i do the mtu packet to like google and such i was trying to find my optimal through cmd prompt and i can't get above 900 or it says i have to defragment it more.


What's your current setup for your connection i.e. do you use wireless, or wired connection etc?

I have a wired connection i wont use a wireless. I think it is just my ISP they are complete crap. I pay 70 dollars a month for 1.5Mb and i usually get 400-500Kb which is ridiculous, its the only thing i can get here. But, other then that idk what it could be at all.
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04 Aug 2011   #19
yeabuddy

windows7 sp1 home premium 64bit
 
 

mine was 1460 at its best i still kept getting 25% loss it was going back and forth with 0% loss and sometimes 50% loss and when i would switch to 1461 it was worst same with 1459 i ran each like 10 times before deciding which one was the best .
But i couldn't find one tha was 0% loss all the time ,is this normal?
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 MTU Limit - Test and change your connection's MTU limit




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