Re: Wierd metro WiFi problem
Jack Unger <[email protected]>
| Newsgroups | gmane.network.wireless.seattle.general |
|---|---|
| Message-ID | <[email protected]> |
Could be a router Ethernet port speed-mismatch issue.
jack
Tyler van Houwelingen wrote:
> I am contacting the best wireless minds I know to help with a bizarre
> issue that has us stumped.
>
> Situation:
> - We have 4 bonded T1 lines currently for our backbone, running a large
> (400 AP) metro WiFi network.
> - When connecting directly into the backbone router, we get 6M down, 6M
> up as expected.
> - However, when we begin to add a little latency between a testing PC
> and the backbone connection, the upload speed stays the same, but the
> download gets hammered. With 10ms of average latency from the metro
> WiFi network side, the speed drops to 2M down and 5M up. At 40ms, it is
> around 800k/5M.
> - The wireless communications are more than fine as we get 8M/8M back to
> our headquarters from anywhere in the metro WiFi network. The problems
> only come from testing into the Internet. We get the same goofy results
> when we disconnect the city network completely and just add latency in
> the lab.
> - We have run all the DrTCP (MTU, RWIN) like tricks which provides some
> improvement, but not much.
>
> Why would this additional latency kill the downloads so much? I suspect
> the problem is with our backbone provider (Expedius) or some limitation
> of metro WiFi that worries me. In our other metro WiFi network, we do
> not see this, but they all use a different backbone provider (AT&T).
>
> Any suggestions to debug/fix this would be very much appreciated.
>
> tyler
>
>
>
> Tyler van Houwelingen
> Founder and CEO
> Azulstar Networks, Inc.
> 1051 Jackson, Grand Haven, MI 49417
> 1117 Rio Rancho Blvd 13, Rio Rancho, NM 87124
> 1-877-AZULSTAR
> www.azulstar.com <http://www.azulstar.com>
>
>
> ------------------------------------------------------------------------
--
Jack Unger - President, Ask-Wi.Com, Inc.
Serving the License-Free Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral WISP Consulting-Training-Troubleshooting
[email protected] (818) 227-4220 http://www.ask-wi.com
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