Bandwidth issues in the Sprint network

Tue Apr 8 16:51:14 UTC 2008

Could be your TCP window size? A 17520 byte TCP window (Windows 2000) 
will cause a single flow to top out at 5Mbps at about 50ms. What is the 
latency on the link?

Try some figures here and see what limit you might be hitting:

http://www.wand.net.nz/~perry/max_download.php?bits_per_second=155000000&ack_size=40&no_delayed_acks=2&mss=1460&rtt=35&wsize=17520&ploss=0

Sam

Brian Raaen wrote:
> I am currently having problems get upload bandwidth on a Sprint circuit. I am 
> using a full OC3 circuit.  I am doing fine on downloading data, but uploading 
> data I can only get about 5Mbps with ftp or a speedtest.  I have tested 
> against multiple networks and this has stayed the same.  Monitoring Cacti 
> graphs and the router I do get about 30Mbps total traffic outbound, but 
> individual (flows/ip?) test always seem limited.  I would like to know if 
> anyone else sees anything similar, or where I can get help.  The assistance I 
> have gotten from Sprint up to this point is that they find no problems.  Due 
> to the consistency of 5Mbps I am suspecting rate limiting, but wanted to know 
> if I was overlooking something else.
>
>   