Web Surfing problems

Paul G. Allen pgallen at randomlogic.com
Tue Mar 2 14:32:57 PST 2004

Joshua Penix wrote:
> On Tue, 2004-03-02 at 13:20, Paul G. Allen wrote:
>>Can anyone give me a clue as to why I can't seem to get to many web 
>>sites? For example, I can ping java.sun.com but I can't get my browser 
>>(Mozilla 1.5 in Linux) to connect to it. Other sites that give me 
> Is it possible that TCP ECN has been set on your machine or a router
> along the way (like your firewall?)
> To find out:
> $ cat /proc/sys/net/ipv4/tcp_ecn
> If it is set to 1, then turn it off by
> # echo 1 > /proc/sys/net/ipv4/tcp_ecn
> To make it permanent (at least on RedHat), edit /etc/sysctl.conf and add
> a line:
> net.ipv4.tcp_ecn = 1
> For further reading on what ECN is, and why machines which don't handle
> it correctly are broken, see:
> http://www.icir.org/floyd/ecn.html
> ... especially the section on "Problems with non-ECN-compatible
> equipment in the network" and for testing the ECN hall of shame might be
> useful:
> http://urchin.earth.li/cgi-bin/ecn.pl

It is off on the local system and I have no control over it on my 
Netgear router. As far as downstream from that, I haven't a clue.

Paul G. Allen
Owner, Sr. Engineer, Security Specialist
Random Logic/Dream Park

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