I assume you've done the obvious and done traceroutes from each end to the other, to confirm no odd routing paths?<br><br>Particularly with the Syd -> WAIX, where return traffic from WAIX may go back a different way than in your Perth WAIX link.<br>
<br>Do the interface graphs for the switches show where traffic may be dropped or retransmitted - eg site A switchport in at 100Mbps, out to site B at 100Mbps, but only in site B at 10Mbps, etc?<br><br>I'd also suggest turning off any port channels on servers for the moment, and run a single ethernet link, just to rule out any LACP weirdness during testing.<br>
<br clear="all">prk<br><br>
<br><br><div class="gmail_quote">On 4 April 2011 22:43, Greg M <span dir="ltr"><<a href="mailto:gregm@servu.net.au">gregm@servu.net.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Mark,<br>
<br>
Unfortunately not a tcp window issue.<br>
<br>
Two servers in Perth, both identical configurations of Win2k8 with dual<br>
gigabit links in a team - one server I can get 100Mbps to, the other only<br>
10Mbps (from a 3rd, identical server in Sydney).<br>
<font color="#888888"><br>
Greg<br>
</font><div><div></div><div class="h5"><br>
-----Original Message-----<br>
From: Mark Smith<br>
[mailto:<a href="mailto:nanog@85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org">nanog@85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org</a>]<br>
Sent: Monday, 4 April 2011 9:24 PM<br>
To: Greg M<br>
Cc: <a href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a><br>
Subject: Re: [AusNOG] Looking for someone who has experience with Nextgen<br>
VPLS<br>
<br>
Hi,<br>
<br>
On Mon, 4 Apr 2011 19:07:16 +0800<br>
"Greg M" <<a href="mailto:gregm@servu.net.au">gregm@servu.net.au</a>> wrote:<br>
<br>
> Hi Noggers,<br>
><br>
><br>
><br>
<snip><br>
<br>
><br>
><br>
> Happy to receive responses on or off-list, and we are happy to pay for<br>
> someone either locally in Sydney or in Perth to help diagnose this -<br>
> as a lot of money is being burnt on this circuit that is not providing<br>
> consistent speeds. We have raised these issues to both Nextgen and<br>
> Telstra and they are pointing the finger at our internal network.<br>
><br>
><br>
<br>
Sounds like you might have TCP window problems due to the large bandwidth<br>
delay products. If that is the case, the following should help -<br>
<br>
Tuning hosts for network performance<br>
<a href="http://www.linuxsa.org.au/meetings/2008-09/linuxsa-network-performance-slide%0As.pdf" target="_blank">http://www.linuxsa.org.au/meetings/2008-09/linuxsa-network-performance-slide<br>
s.pdf</a><br>
<br>
TCP performance and the Web100 project<br>
<a href="http://www.linuxsa.org.au/meetings/2003-09/tcpperformance.screen.pdf" target="_blank">http://www.linuxsa.org.au/meetings/2003-09/tcpperformance.screen.pdf</a><br>
<br>
<a href="http://www.psc.edu/networking/projects/tcptune/" target="_blank">http://www.psc.edu/networking/projects/tcptune/</a><br>
<br>
Regards,<br>
Mark.<br>
<br>
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</div></div></blockquote></div><br>