Does anyone know if it is possible to increase the speed limit of the TAP-Win32 adapter? If so, please post directions.
When I set-up an OpenVPN server on a Windows XP system using a bridged configuration, the overall, bridged speed is limited to the speed of the TAP-Win32 adapter -- 10 Mbps. This slows all the other functions that the server is performing.
TAP-Win32 Adapter is Limited to 10 Mbps
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longknife
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gladiatr72
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Re: TAP-Win32 Adapter is Limited to 10 Mbps
Hey there,
I don't have an actual answer for you. Honestly, someone told me in (I think) 1997, "Sure, you can setup Windows NT to route packets, but it's not very good at it." Since then it hasn't occurred to me to use a Windows system as a network device, and began the divot that became the hole in my knowledge that leads to this message!
I googled "tap-win32 speed". The results were rather uninformative. Have you run any on-LAN network benchmarks that show this bottleneck? I'd be interested in seeing the results.
Regards,
Stephen
I don't have an actual answer for you. Honestly, someone told me in (I think) 1997, "Sure, you can setup Windows NT to route packets, but it's not very good at it." Since then it hasn't occurred to me to use a Windows system as a network device, and began the divot that became the hole in my knowledge that leads to this message!
I googled "tap-win32 speed". The results were rather uninformative. Have you run any on-LAN network benchmarks that show this bottleneck? I'd be interested in seeing the results.
Regards,
Stephen
[..]I used to think it was awful that life was so unfair. [...]Wouldn't it be much worse if life were fair, and all the terrible things that happen to us come because we actually deserve them? -Marcus Cole
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longknife
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Re: TAP-Win32 Adapter is Limited to 10 Mbps
Yes, I verified the speed reduction using speedtest.net. With the 10 Mbps bridge speed, I could get only 7.5 Mbps download speed. Before the bridge, I could get 20-30 Mbps. Windows also tells you the adapter speeds by hovering the mouse pointer over it in the system tray.
My computer's motherboard has a 1394 adapter (400 Mbps) and an ethernet adapter (100 Mbps). The first time I built the bridge, I chose only the ethernet adapter and the TAP-Win32 adapter (10 Mbps). The resulting bridge speed was 10Mbps.
Just for the heck of it, I deleted the bridge and rebuilt it using all three adapters. Lo and behold, the resulting bridge speed was reported by Windows as 400 Mbps. My resulting ethernet performance was back to normal -- 20 Mbps to 30 Mbps download speed using speedtest.net.
My conclusion is that the bridge speed reduction that I initially incurred was due to some quirk in Windows XP SP3.
By the way, I looked for the adapter speed settings in the Windows registry but could not find them. I guess that I'm just lucky to have accidentally found a work-around.
My computer's motherboard has a 1394 adapter (400 Mbps) and an ethernet adapter (100 Mbps). The first time I built the bridge, I chose only the ethernet adapter and the TAP-Win32 adapter (10 Mbps). The resulting bridge speed was 10Mbps.
Just for the heck of it, I deleted the bridge and rebuilt it using all three adapters. Lo and behold, the resulting bridge speed was reported by Windows as 400 Mbps. My resulting ethernet performance was back to normal -- 20 Mbps to 30 Mbps download speed using speedtest.net.
My conclusion is that the bridge speed reduction that I initially incurred was due to some quirk in Windows XP SP3.
By the way, I looked for the adapter speed settings in the Windows registry but could not find them. I guess that I'm just lucky to have accidentally found a work-around.