 drshock
join:2000-08-19
Wake Forest, NC
 ·RoadRunner Cable
1 edit | Windows 7 MTU I know there's no tweaking on Vista or 7. But I have a peculiar issue with this new Windows 7 Home Premium PC from HP.
The default MTU is set to 1504. I researched how to change it, but before I do wanted to understand why it set itself to that out of the box from HP.
I have been seeing a small number, less than .003% of errors under WAN statistics (I have a wired only router no radio).
Anyone know any reason for this and safe to force the MTU to 1500? I am on cable not DSL.
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Live for today.... |
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 Irish SharkPlay Like A Champion TodayPremium,MVM
join:2000-07-29
Las Vegas, NV
kudos:3 | There are a couple of things going on here. If you used the Tweak Tester to view the MTU, it will report 1480 (IIRC). That is a false error. Win 7 will report a bogus MTU; it is not 1480.
Since you did not say where you got the 1504 from, I cannot answer that.
To see what MTU Win 7 is really set to, do this. Open a Command Prompt as an administrator and run this
netsh interface ipv4 show subinterfaces
That is what the real MTU is.
This is what I show after setting the MTU to 1500.
C:\Windows\system32>netsh interface ipv4 show subinterfaces
MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 7347 Loopback Pseudo-Interface 1
1500 1 17886232 1941027 Local Area Connection
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"You can observe a lot by watching". Yogi Berra |
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drshock
join:2000-08-19
Wake Forest, NC Reviews:
·RoadRunner Cable
| Hey I only use netsh also. For mine it shows 1504 where yours has 1500. I have a Vista Home PC too that shows 1500 so the extra 4 surprised me. Just for grins I reinstalled the HP recovery CD and it is still 1504.
Been wondering if this could be the source of the WAN errors on the packet statistics. Being a hard wired network I've never seen anything but 0's in all LAN/WAN router dropped/error fields.
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Irish SharkPlay Like A Champion TodayPremium,MVM
join:2000-07-29
Las Vegas, NV
kudos:3 | If that is what you see BEFORE setting the MTU, I have no idea why it would report that.
What I am showing is the MTU AFTER I set it to 1500.
Are you saying that you get 1504 AFTER you set the MTU or BEFORE you set the MTU?
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"You can observe a lot by watching". Yogi Berra |
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drshock
join:2000-08-19
Wake Forest, NC | Before, and I didn't want to force it to 1500 without knowing why it was set to 1504 out of the box. I've had several Vista boxes and they all were 1500 out of the box.
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Live for today.... |
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Irish SharkPlay Like A Champion TodayPremium,MVM
join:2000-07-29
Las Vegas, NV
kudos:3 | I did some searching and I found various scenarios where the MTU is set to 1504. You can see if any of these cases might bee the cause of the MTU set to 1504.
»www.google.com/search?q=vista+mt···&ie=&oe=
»www.google.com/search?q=vista+mt···&ie=&oe=
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"You can observe a lot by watching". Yogi Berra |
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