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	<title>Comments on: Don&#8217;t mess with half-open connections!</title>
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	<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/</link>
	<description>Where I write ...</description>
	<lastBuildDate>Sun, 23 Aug 2009 20:52:29 +0000</lastBuildDate>
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		<title>By: JesseG</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-23</link>
		<dc:creator>JesseG</dc:creator>
		<pubDate>Sun, 23 Aug 2009 20:52:29 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-23</guid>
		<description>Or you could put DD-WRT on your Linksys.  If you set the TCP timeouts to 180 seconds (UDP is fine at 120, but 180 doesn&#039;t hurt either) you can get away with the max of 4096 connections in a router with 16 MB of memory.  And it runs so smooth, never have to reboot the dang router, etc.  The 15m load average when I&#039;m maxing out my uTorrent (I have conservative download/upload limits) is only around 0.10 to 0.20... so the router really isn&#039;t even breaking a sweat.

If you are having speed issues in your browser then you&#039;re either:

Overloading your connection RATE, limit your downloads to allow at least 32KB/s through, or more like 128KB/s if you have a multi Mb/s down.

Or - you&#039;re overloading the connection limit on your router.  If rebooting the router &quot;helps&quot; restore the connection than that&#039;s the problem is your router is chocking on the connections.  Some Linksys routers leave connections open for half an hour, lol.  So changing the half-open connections OR NOT can choke those routers either way.  The thing you need to be careful of on those is the TOTAL amount of connections allowed.  And limiting that can hit your download speeds more than half-open limits, but that&#039;s what you get for running crappy software on your router.  Upgrade to DD-WRT.  ;)</description>
		<content:encoded><![CDATA[<p>Or you could put DD-WRT on your Linksys.  If you set the TCP timeouts to 180 seconds (UDP is fine at 120, but 180 doesn&#8217;t hurt either) you can get away with the max of 4096 connections in a router with 16 MB of memory.  And it runs so smooth, never have to reboot the dang router, etc.  The 15m load average when I&#8217;m maxing out my uTorrent (I have conservative download/upload limits) is only around 0.10 to 0.20&#8230; so the router really isn&#8217;t even breaking a sweat.</p>
<p>If you are having speed issues in your browser then you&#8217;re either:</p>
<p>Overloading your connection RATE, limit your downloads to allow at least 32KB/s through, or more like 128KB/s if you have a multi Mb/s down.</p>
<p>Or &#8211; you&#8217;re overloading the connection limit on your router.  If rebooting the router &#8220;helps&#8221; restore the connection than that&#8217;s the problem is your router is chocking on the connections.  Some Linksys routers leave connections open for half an hour, lol.  So changing the half-open connections OR NOT can choke those routers either way.  The thing you need to be careful of on those is the TOTAL amount of connections allowed.  And limiting that can hit your download speeds more than half-open limits, but that&#8217;s what you get for running crappy software on your router.  Upgrade to DD-WRT.  <img src='http://s.wordpress.com/wp-includes/images/smilies/icon_wink.gif' alt=';)' class='wp-smiley' /> </p>
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		<title>By: Agrees with the rest</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-22</link>
		<dc:creator>Agrees with the rest</dc:creator>
		<pubDate>Wed, 29 Apr 2009 02:18:22 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-22</guid>
		<description>I have to agree with you about the whole &quot;max half-open connections&quot; issue. I have the newest version of UTorrent and it was, at times, completely choking up my page loading speeds. One I undid the changes the browsing speeds increased (Also, I&#039;m not sure if this is coincidence, but my dl. speed increased as well o.O).

I also have to agree that the Linksys WRT54G Is prone to choking up. I may look into the newer version or a different one entirely.

Good luck to all of you.</description>
		<content:encoded><![CDATA[<p>I have to agree with you about the whole &#8220;max half-open connections&#8221; issue. I have the newest version of UTorrent and it was, at times, completely choking up my page loading speeds. One I undid the changes the browsing speeds increased (Also, I&#8217;m not sure if this is coincidence, but my dl. speed increased as well o.O).</p>
<p>I also have to agree that the Linksys WRT54G Is prone to choking up. I may look into the newer version or a different one entirely.</p>
<p>Good luck to all of you.</p>
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		<title>By: Sumod</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-21</link>
		<dc:creator>Sumod</dc:creator>
		<pubDate>Fri, 05 Dec 2008 10:07:45 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-21</guid>
		<description>Excellent points! Linksys WRT54G in particular chokes up really fast. I have set ut to do no more than 50 connections per torrent and a total of 200 connections, which is working great, saturates a 2mbit connection now.

However, &#039;max half-open connections&#039; affects the _rate_ at which the connections get estabilished, and is therefore of much less utility as a tweakable property. Its side effect of choking the network is limited to the TCP/IP stack of just the pc running ut, not the entire home network, so in my case it was not the router&#039;s fault.

Thanks for the useful pointers!</description>
		<content:encoded><![CDATA[<p>Excellent points! Linksys WRT54G in particular chokes up really fast. I have set ut to do no more than 50 connections per torrent and a total of 200 connections, which is working great, saturates a 2mbit connection now.</p>
<p>However, &#8216;max half-open connections&#8217; affects the _rate_ at which the connections get estabilished, and is therefore of much less utility as a tweakable property. Its side effect of choking the network is limited to the TCP/IP stack of just the pc running ut, not the entire home network, so in my case it was not the router&#8217;s fault.</p>
<p>Thanks for the useful pointers!</p>
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		<title>By: b10nary</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-20</link>
		<dc:creator>b10nary</dc:creator>
		<pubDate>Wed, 19 Nov 2008 00:10:29 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-20</guid>
		<description>I am running utorrent ver. 1.8 build 11813 and my browser speeds are super fine, and downloads are fast as usual, running winxp sp3 too.</description>
		<content:encoded><![CDATA[<p>I am running utorrent ver. 1.8 build 11813 and my browser speeds are super fine, and downloads are fast as usual, running winxp sp3 too.</p>
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		<title>By: xenover</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-19</link>
		<dc:creator>xenover</dc:creator>
		<pubDate>Tue, 19 Aug 2008 12:12:36 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-19</guid>
		<description>Ture, Don&#039;t Mess with the net.max_halfopen!
It just turn&#039;s your browser very slow!
But if you DID it already just change it back to 4 (on utorrent) then it&#039;ll be normal again</description>
		<content:encoded><![CDATA[<p>Ture, Don&#8217;t Mess with the net.max_halfopen!<br />
It just turn&#8217;s your browser very slow!<br />
But if you DID it already just change it back to 4 (on utorrent) then it&#8217;ll be normal again</p>
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		<title>By: VuJa</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-18</link>
		<dc:creator>VuJa</dc:creator>
		<pubDate>Sat, 09 Aug 2008 15:55:55 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-18</guid>
		<description>This shit fucked up my computer it runs slower and torrent is still fucked up.........</description>
		<content:encoded><![CDATA[<p>This shit fucked up my computer it runs slower and torrent is still fucked up&#8230;&#8230;&#8230;</p>
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		<title>By: escafu</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-17</link>
		<dc:creator>escafu</dc:creator>
		<pubDate>Fri, 02 May 2008 10:38:48 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-17</guid>
		<description>c&#039;mon people it&#039;s not that hard.. if you patch your windows xp tcpip.sys to 50 half-open connections then in utorrent set net.max_halfopen to 40. this will keep the same ratio (8/10). also you need to limit utorrent&#039;s upload and download rates so it doesn&#039;t use up all your bandwidth. utorrent 1.7.7 is working like a frickin&#039; champion for me now after using LvlLord&#039;s patch, and my email, browser etc. all still work fine (on a 128k connection!).</description>
		<content:encoded><![CDATA[<p>c&#8217;mon people it&#8217;s not that hard.. if you patch your windows xp tcpip.sys to 50 half-open connections then in utorrent set net.max_halfopen to 40. this will keep the same ratio (8/10). also you need to limit utorrent&#8217;s upload and download rates so it doesn&#8217;t use up all your bandwidth. utorrent 1.7.7 is working like a frickin&#8217; champion for me now after using LvlLord&#8217;s patch, and my email, browser etc. all still work fine (on a 128k connection!).</p>
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		<title>By: Christian</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-15</link>
		<dc:creator>Christian</dc:creator>
		<pubDate>Tue, 19 Feb 2008 21:43:00 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-15</guid>
		<description>You can avoid your torrent downloads crippling your other internet apps.

1) Don&#039;t set the half open connections to 250 - that is WAY to much for a 1 Mbit connection.
The patch suggests 50 connections and that should work well for most people. There are diminishing returns to increase the limit of connections anyways so don&#039;t feel bad about setting a lower limit.

2) Too much traffic and too many packets choke programs using the internet connection, but you can resolve this problem by using QoS traffic shaping either in your hardware router, your software router, or on your own pc.
It prioritizes internet traffic according to importance, so your torrent traffic will not choke internet browsing and will make your internet connection feel much more responsive. It should also boost your speed because the connection will be utilized better.
Whatever you set your max connection limit to , make sure to reserve a few connections for other traffic like browsers and mailprogram and such. 10 connections reserved should be plenty, as it is after all the max limit on a unpatched Windows pc.
So if you patch your limit to 50 , set your torrent program to use max 40.

For a hardware router you can use a custom firmware with QoS , like f.x Tomato :
http://www.polarcloud.com/tomato/
If you need a router then I suggest Buffalo routers - They are quite good in my experience.

For a software router (usually a linux pc) there are several way to do this and packages that help you do this .. I did a quick search and found http://www.mastershaper.org/ which looks interesting.

For a Windows client you can use Cfosspeed : http://www.cfos.de/speed/cfosspeed_e.htm
Cfos also have a page that explains traffic shaping :
http://www.cfos.de/traffic_shaping/traffic_shaping_e.htm
A good read if you are new to the subject.</description>
		<content:encoded><![CDATA[<p>You can avoid your torrent downloads crippling your other internet apps.</p>
<p>1) Don&#8217;t set the half open connections to 250 &#8211; that is WAY to much for a 1 Mbit connection.<br />
The patch suggests 50 connections and that should work well for most people. There are diminishing returns to increase the limit of connections anyways so don&#8217;t feel bad about setting a lower limit.</p>
<p>2) Too much traffic and too many packets choke programs using the internet connection, but you can resolve this problem by using QoS traffic shaping either in your hardware router, your software router, or on your own pc.<br />
It prioritizes internet traffic according to importance, so your torrent traffic will not choke internet browsing and will make your internet connection feel much more responsive. It should also boost your speed because the connection will be utilized better.<br />
Whatever you set your max connection limit to , make sure to reserve a few connections for other traffic like browsers and mailprogram and such. 10 connections reserved should be plenty, as it is after all the max limit on a unpatched Windows pc.<br />
So if you patch your limit to 50 , set your torrent program to use max 40.</p>
<p>For a hardware router you can use a custom firmware with QoS , like f.x Tomato :<br />
<a href="http://www.polarcloud.com/tomato/" rel="nofollow">http://www.polarcloud.com/tomato/</a><br />
If you need a router then I suggest Buffalo routers &#8211; They are quite good in my experience.</p>
<p>For a software router (usually a linux pc) there are several way to do this and packages that help you do this .. I did a quick search and found <a href="http://www.mastershaper.org/" rel="nofollow">http://www.mastershaper.org/</a> which looks interesting.</p>
<p>For a Windows client you can use Cfosspeed : <a href="http://www.cfos.de/speed/cfosspeed_e.htm" rel="nofollow">http://www.cfos.de/speed/cfosspeed_e.htm</a><br />
Cfos also have a page that explains traffic shaping :<br />
<a href="http://www.cfos.de/traffic_shaping/traffic_shaping_e.htm" rel="nofollow">http://www.cfos.de/traffic_shaping/traffic_shaping_e.htm</a><br />
A good read if you are new to the subject.</p>
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		<title>By: Matt</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-14</link>
		<dc:creator>Matt</dc:creator>
		<pubDate>Tue, 12 Feb 2008 10:19:21 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-14</guid>
		<description>I&#039;m using 1.7.7 and have it set at 80 IE won&#039;t work when utorrent is running but just turn utorrent off and IE is back to normal. So watch TV when downloading! easy!</description>
		<content:encoded><![CDATA[<p>I&#8217;m using 1.7.7 and have it set at 80 IE won&#8217;t work when utorrent is running but just turn utorrent off and IE is back to normal. So watch TV when downloading! easy!</p>
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		<title>By: djferrick</title>
		<link>http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-13</link>
		<dc:creator>djferrick</dc:creator>
		<pubDate>Sat, 26 Jan 2008 15:02:13 +0000</pubDate>
		<guid isPermaLink="false">http://sumod.wordpress.com/2007/09/07/dont-mess-with-half-open-connections/#comment-13</guid>
		<description>Hi. Thanks for the tip. I updated to 1.7.6 and then my internet and my torrents slowed and stopped. Had I not read this I would not have known to reset my half open connections back to 8. Now it&#039;s all working perfectly again. Cheers</description>
		<content:encoded><![CDATA[<p>Hi. Thanks for the tip. I updated to 1.7.6 and then my internet and my torrents slowed and stopped. Had I not read this I would not have known to reset my half open connections back to 8. Now it&#8217;s all working perfectly again. Cheers</p>
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