Comments on: TCP Window Scaling and kernel 2.6.17+ http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/ Moo - Development, Trouble-shooting and Random thoughts... Thu, 01 Mar 2012 22:58:01 +0000 hourly 1 http://wordpress.org/?v=3.1.1 By: blingo http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-2688 blingo Thu, 01 Oct 2009 08:16:53 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-2688 Thanks a lot, until reading this I was using old kernels to resolve this.. Thanks a lot, until reading this I was using old kernels to resolve this..

]]> By: Dao-Chen Zheng http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-2532 Dao-Chen Zheng Tue, 19 May 2009 18:25:22 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-2532 On Linux, is there a way to increase the TCP window size in the TCP header to a larger value than 0x16d0 (5840)? I would like to keep TCP window size more or less unchanged at 5840*128 by increasing "16 D0" to something like "FF FF" and reducing the Window Scaling Factor to a smaller value than 128. Basically, I am trying to find a workaround for the web sites that have the bug of ignoring TCP window scaling without having an impact on other web sites. Thanks. On Linux, is there a way to increase the TCP window size in the TCP header to a larger value than 0x16d0 (5840)?

I would like to keep TCP window size more or less unchanged at 5840*128 by increasing “16 D0″ to something like “FF FF” and reducing the Window Scaling Factor to a smaller value than 128.

Basically, I am trying to find a workaround for the web sites that have the bug of ignoring TCP window scaling without having an impact on other web sites.

Thanks.

]]> By: linsec.ca blog » Blog Archive » Welcome back, kernel 2.6.17+ http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-2399 linsec.ca blog » Blog Archive » Welcome back, kernel 2.6.17+ Tue, 25 Mar 2008 19:18:23 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-2399 [...] Due to an issue that the 2.6.17+ kernel exemplified, all of the sites I host (annvix.org, linsec.ca, danen.ca, etc.) have been unavailable to anyone using a 2.6.17+ kernel due to a change in the way TCP window scaling was implemented, which has been noted in a number of places (here’s one: TCP Window Scaling and kernel 2.6.17+). [...] [...] Due to an issue that the 2.6.17+ kernel exemplified, all of the sites I host (annvix.org, linsec.ca, danen.ca, etc.) have been unavailable to anyone using a 2.6.17+ kernel due to a change in the way TCP window scaling was implemented, which has been noted in a number of places (here’s one: TCP Window Scaling and kernel 2.6.17+). [...]

]]> By: Grant Carmichael » Blog Archive » Is your Linux box running slow behind your firewall? http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-2320 Grant Carmichael » Blog Archive » Is your Linux box running slow behind your firewall? Thu, 31 Jan 2008 19:47:18 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-2320 [...] First read the following articles: [...] [...] First read the following articles: [...]

]]> By: chouse http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-2318 chouse Wed, 30 Jan 2008 20:47:47 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-2318 Totally solved my issue with RHEL5. Big thanks. Totally solved my issue with RHEL5. Big thanks.

]]> By: sathish http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-1610 sathish Mon, 13 Aug 2007 04:52:02 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-1610 How to turn off windows scaling on windows xp pc How to turn off windows scaling on windows xp pc

]]> By: bizarre lack of HTTP response problem - Page 2 - Linux Forums http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-1293 bizarre lack of HTTP response problem - Page 2 - Linux Forums Fri, 29 Jun 2007 06:58:51 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-1293 [...] explanation / workaround Recently I found out what is going on with this bug. The problem has to do with larger default buffer sizes for TCP window scaling in recent Linux kernel versions. If there is an improperly configured router between you and the server you're trying to reach, it will create a bottleneck and you'll get no data from the server. The long and the short of it is that it is not a Linux bug. Here are some better, more detailed explanations: John [...] explanation / workaround Recently I found out what is going on with this bug. The problem has to do with larger default buffer sizes for TCP window scaling in recent Linux kernel versions. If there is an improperly configured router between you and the server you’re trying to reach, it will create a bottleneck and you’ll get no data from the server. The long and the short of it is that it is not a Linux bug. Here are some better, more detailed explanations: John

]]> By: infotage.net » Blog Archive » Debian ip stack tuning http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-391 infotage.net » Blog Archive » Debian ip stack tuning Sat, 17 Mar 2007 01:58:58 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-391 [...] http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/ [...] [...] http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/ [...]

]]> By: The Adventures of Slightly Taller Than Average Man » Fedora kernel upgrade caused excruciatingly slow network speeds http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-346 The Adventures of Slightly Taller Than Average Man » Fedora kernel upgrade caused excruciatingly slow network speeds Mon, 05 Mar 2007 09:20:37 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-346 [...] Googling found nothing, so I had to grin and bear it until the sysadmin found a fix.  After a while, he came across this solution (from here). echo 0 > /proc/sys/net/ipv4/tcp_window_scaling [...] [...] Googling found nothing, so I had to grin and bear it until the sysadmin found a fix.  After a while, he came across this solution (from here). echo 0 > /proc/sys/net/ipv4/tcp_window_scaling [...]

]]> By: Murray http://inodes.org/2006/09/06/tcp-window-scaling-and-kernel-2617/comment-page-1/#comment-49 Murray Thu, 23 Nov 2006 05:53:53 +0000 http://inodes.org/blog/2006/09/06/tcp-window-scaling-and-kernel-2617/#comment-49 Another way... vi /etc/sysctl.conf add the following two lines net.ipv4.tcp_wmem = 4096 16384 131072 net.ipv4.tcp_rmem = 4096 87380 174760 sysctl -p Another way…

vi /etc/sysctl.conf

add the following two lines

net.ipv4.tcp_wmem = 4096 16384 131072
net.ipv4.tcp_rmem = 4096 87380 174760

sysctl -p

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