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Slow WAN upload on 100Mbps Link, Server 2003
We have a collocated web server running Windows Server 2003 SBS. The provider has provisioned 100Mbps for our use. The provider has said there are no concurrent connection, or session bandwidth limits on their router to our server.
The office I'm working from has Comcast 50Mbps down 10Mbps up. I can only get at max 1.5MB/s (roughly 12Mbps) on a single connection. However, when running two concurrent downloads from our collocated server, both downloads run at 1.5MB/s. I've messed with the GlobalMaxTcpWindowSize, and Tcp1323Opts registry keys to enable window scaling negotiation per tcp session, on both the client and server. However haven't noticed any difference... and I've confirmed with wireshark that window scaling is in effect.
an interesting note.... I can only achieve the 1.5MB/s when using a Linux client, windows clients typically see between 275KB/s-800KB/s. Downloads from other sites (such as nvidia.com drivers) come in at full speed regardless of what client OS we use.
I've tried downloading from home on another 30down/10up connection and have the same results with windows clients....
The office I'm working from has Comcast 50Mbps down 10Mbps up. I can only get at max 1.5MB/s (roughly 12Mbps) on a single connection. However, when running two concurrent downloads from our collocated server, both downloads run at 1.5MB/s. I've messed with the GlobalMaxTcpWindowSize, and Tcp1323Opts registry keys to enable window scaling negotiation per tcp session, on both the client and server. However haven't noticed any difference... and I've confirmed with wireshark that window scaling is in effect.
an interesting note.... I can only achieve the 1.5MB/s when using a Linux client, windows clients typically see between 275KB/s-800KB/s. Downloads from other sites (such as nvidia.com drivers) come in at full speed regardless of what client OS we use.
I've tried downloading from home on another 30down/10up connection and have the same results with windows clients....
ASKER
We a part of a private subnet at the colo facility, as far as i can tell, we're plugged into a 100Mbps switch...
The router port forwards to our servers internal IP, so we're not directly connected.
speedtests have always shown results close to what we should be getting... That's why this is all so confusing... However, when doing the speed test, the IP that is shown we're connecting with, differs from the static IP that is port forwarded.... I can't reasonably determine if they are apart of the same trunk, but i suspect they are.
The server is running 100Mbps/Full Duplex
Thanks for the help!
The router port forwards to our servers internal IP, so we're not directly connected.
speedtests have always shown results close to what we should be getting... That's why this is all so confusing... However, when doing the speed test, the IP that is shown we're connecting with, differs from the static IP that is port forwarded.... I can't reasonably determine if they are apart of the same trunk, but i suspect they are.
The server is running 100Mbps/Full Duplex
Thanks for the help!
Do you have bandwidth throttling turned on in your web server? Wouldn't explain why your windows clients were slower but worth looking at real quick.
ASKER
No throttling with the service., we checked that out first. Just for my knowledge is there a directive in the apache 2.2.11 conf file that does dothrottling without the throttling module?
ASKER
I was hoping that maybe it being windows SBS would explain it but I havnt found documentation mentioning some kind of per session upload for http.
Nothing's jumping out at me on Apache. (I had assume you were using IIS). See references to mod_cband and mod_throttle, but I assume you do not have them installed or enabled in your conf file.
ASKER
That's correct. Not enabled....
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We have a Business ethernet line from our isp. Granted our speed is not has high as yours but a 10down/10up. We have to change our Nic card manuallly to 10mbps with full duplex to get our 10mbps from the isp. If we set it to auto or gigabit, the connection went down to 6mbps. Go figure.