Re: kernel network problem ?

[Mathieu Chouquet-Stringer <mchouque@e-steel.com>]

You have to take a look at ENC:
Explicit Congestion Notification (ECN) allows routers to notify
clients about network congestion, resulting in fewer dropped packets
and increased network performance. This option adds ECN support to the
Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn) which
allows ECN support to be disabled at runtime.

Note that, on the Internet, there are many broken firewalls which
refuse connections from ECN-enabled machines, and it may be a while
before these firewalls are fixed. Until then, to access a site behind
such a firewall (some of which are major sites, at the time of this
writing) you will have to disable this option, either by saying N now
or by using the sysctl.

You can disable it at runtime with:
echo 0 > /proc/sys/net/ipv4/tcp_ecn

nparpand@perinfo.com ("Nicolas Parpandet") writes:
> Hi all,
> 
> I'm testing 2.4 series for few weeks,
> even the last prerelease
> 
> I've seen stranges things  :
> 
> I cannot access to some ips adresses ! :
> in http or in smtp using "konqueror", "netscape",
> "mail",  "telnet 25".
> 
> I cannot login to hotmail (in the web page:http) 
> or send mail (smtp) to hotmail users (don't blame me !!)
> All the others network things works well, the network in general seems
> good only very few sites like hotmail doesn't works.
> 
> And only with 2.4 series !! not with 2.2 ...
> 
> maybe it's a glibc or kernel issue, I'dont know.
> I have an intel SMP motherboard connected to the net (cable) 
> with a PCI realtek 8019.
> 
> I didn't analyse packets sent. If somebody else have the
> same problems ...
> 
> Nicolas.
> 
> Sorry for my poor english.
> 
> PS: funny "bug" isn't it ? (hotmail !)
> PS2: thanks for all, very good job done, 
>       2.4 is very fast and seems stable.
> 
> 
> 
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-- 
Mathieu CHOUQUET-STRINGER              E-Mail : mchouque@e-steel.com
     Learning French is trivial: the word for horse is cheval, and
               everything else follows in the same way.
                        -- Alan J. Perlis
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