<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:D="DAV:" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
margin-top:0in;
margin-right:0in;
margin-bottom:.75pt;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p><span style='font-family:"Tahoma","sans-serif";color:black'>Hello Everyone,<o:p></o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'><o:p> </o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'>We’ve
recently uncovered an issue that manifests as slow RDP access when connecting
from some of our remote sites (over Cisco gear) using the Windows Vista
Operating System.<o:p></o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'><o:p> </o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'>The official
response from Microsoft:<o:p></o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'><o:p> </o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'>“The
Microsoft Windows Vista OS enables the TCP Window Scaling option by default
(previous Windows OSes had this option disabled). The TCP Window Scaling option
is described in <a href="http://www.ietf.org/rfc/rfc1323.txt?number=1323"><span
style='color:#0066CC'>RFC 1323</span></a> (TCP Extensions for High
Performance), and allows for the device to advertise a receive window larger
than 65 K than TCP originally specified. This is useful in the higher speed
networks of today, where more data can be outstanding on the wire before it is
acknowledged. This slow performance, or dropped TCP connections is caused by
some versions of Cisco IOS® Firewall software not supporting the TCP Window
Scaling option. This causes it to have a much smaller TCP window than the endpoints
actually have. This causes the Cisco IOS router that runs the IOS Firewall
feature set to drop packets that it believes are outside the TCP window, but
which really are not.”<o:p></o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'><o:p> </o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'>The supported
versions are Cisco IOS Software Release 12.3(15) or later. <o:p></o:p></span></p>
<p><span style='font-family:"Tahoma","sans-serif";color:black'><a
href="http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a0080743212.shtml"
title="http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a0080743212.shtml">http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a0080743212.shtml</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'>I
have found a workaround that can be implemented on Windows Vista.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'>netsh
int tcp set global autotuninglevel=disabled<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'>netsh
int tcp set global rss=disabled<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"'>This
series of commands has the affect of disabling TCP Window Scaling. <o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:12.0pt;
font-family:"Arial","sans-serif"'><o:p> </o:p></span></b></p>
<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:12.0pt;
font-family:"Arial","sans-serif"'>Corbett Enders</span></b><span
style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Arial","sans-serif"'>Network
Manager<br>
Homes by Avi<br>
Tel: (403) 536-7170<br>
Fax: (403) 536-7171<br>
</span><a href="http://www.homesbyavi.com"><span style='font-family:"Arial","sans-serif";
color:blue'>www.homesbyavi.com</span></a><span style='font-family:"Arial","sans-serif"'>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>