<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:m="http://schemas.microsoft.com/office/2004/12/omml" 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:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
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;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
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=NO-BOK link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span lang=EN-US>We are using OLSR in a wireless network
with nodes having both an air interface and a LAN interface.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The OLSR routing is used for the air
interfaces. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>In order to inform the other nodes of the
relation between each node's air interface IP address and LAN IP address, we
use the HNA function.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>What we experience is that a node will
transmit UDP/IP unicast packets with a LAN IP address as long as the validity
time of the HNA message from that particular node is not exceeded even when the
OLSR link is broken. Our assumption was that packets addressed to such HNA
given addresses would not be transmitted unless there exists a valid link
between the related air interface IP addresses established by the HELLO and TC
messages.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>As it functions there are two drawbacks;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>1. The air interface capacity is wasted
with packet transmissions getting nowhere - and not stopped before the HNA
validity time is past after a link is broken.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>2. After the HNA validity time is past, it
takes a long time to reestablish the link to the HNA given address (depending
on the HNA interval time) after the air interface link is reestablished by the
HELLO and TC messages. Short HNA interval times is not a solution due to more
OLSR overhead traffic.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Have we implemented OLSR correctly or is
this how OLSR functions?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Hans Jonassen<o:p></o:p></span></p>
</div>
</body>
</html>