Several windows in the same PC, doing file transfer in parallel, each get the same speed as one. The speed is peaking at some specific speed every single time, and the several windows reach this peak.

I smell classic TCP window size  bumping into (bandwidth x delay).

Have you tried with iperf, using UDP ?




Mike Lyon wrote:
Have him do a traceroute from his PC or router to where he is trying to
download from. Where is it choking?

On Fri, Apr 17, 2009 at 3:21 PM, chandrashakher pawar <
[email protected]> wrote:

Configuration
================================
sh run interface FastEthernet1/3/1
Building configuration...
Current configuration : 351 bytes
!
interface FastEthernet1/3/1
 description CUST:xxx
 bandwidth 100000
 ip address 116.0.85.13 255.255.255.252
 no ip redirects
 no ip directed-broadcast
 load-interval 30
 negotiation auto
 no cdp enable
end
========
No errors on the interface.
none of our customer on this router has complait us this issue
i have changed this to "negotiation auto" as suggested by one of our
member.
tommorow customer will test again and reply.
round-trip-time is good, no bacbone chocked.
Unit will not make bit differnce as: The customer tried troubleshooting the
issue after connecting laptop directily to the 100 mbps link.
In that case also the result was same.

Regards
Chandrashakher Pawar
IPNOC
Customer & Services Operations
Tata communication AS6453
mobil + 91 9225633948 + 91 9324509268
[email protected]







On Fri, Apr 17, 2009 at 10:57 PM, Scott Weeks <[email protected]
wrote:

--- [email protected] wrote:
From: chandrashakher pawar <[email protected]>

We are level one ISP. one of my customer is connected to fast ethernet.
His link speed 100,000 kbps. while downloading any thing from net he
downloading speed donot go above 200 kbps.
While doing multiple download he get aroung 200 kbps in every window. But
when he close all the windows no change in downloading speed is observed.
---------------------------------------------


You would need to add more info for any meaningful troubleshooting to
occur.  Do you see errors on the interface?  Clear the counters and watch
for a while.

scott




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