[PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Shawn Starr]

Here's something strange that i've been noticing with 2.4.0. Some websites I am
unable to access now. For example:

http://www.scotiabank.ca/simplify/index.html

if your in Canada and you have Scotia banking online, try and access their
banking sites. It will just hang. However upon trying the same in Windows 2000
(cough). The site works fine.

Could there be a network driver issue as even trying with telnet port 80 fails
as well?

Im not sure on this one this seems bizarre. I have the same problem with
www.workopolis.com, theglobeandmail.com, perhaps there's some sort of packet or
frame not being processed properly?

I can ICMP ping all the sites fine and i can access them from other shells.
I have spoken to some of their engineers and they say that there is nothing
blocking/no firewalls configured to deny access to theses sites.

If there's any information you need I'd be glad to try and figure this one out.

Shawn S.



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Re: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Miles Lane]

Make sure your kernel build .config file contains the line:

	# CONFIG_INET_ECN is not set

not

	CONFIG_INET_ECN=y

Here's what the kernel configuration help has to say:

  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.


Shawn Starr wrote:
> 
> Here's something strange that i've been noticing with 2.4.0. Some websites I am
> unable to access now. For example:
> 
> http://www.scotiabank.ca/simplify/index.html

<snip>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Re: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Matti Aarnio]

On Fri, Jan 12, 2001 at 04:37:35PM -0500, Shawn Starr wrote:
> Here's something strange that i've been noticing with 2.4.0. Some
> websites I am unable to access now. For example:

  This is FAQish thing.  DON'T USE TCP_ECN unless you want trouble!

    # echo 0 > /proc/sys/net/ipv4/tcp_ecn

> Shawn S.

/Matti Aarnio
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Re: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Shawn Starr]

Oh, hrm.... Guess I shouldn't have turned that on ;)
Sorry. nevermind :)


Miles Lane wrote:

> Make sure your kernel build .config file contains the line:
>
>         # CONFIG_INET_ECN is not set
>
> not
>
>         CONFIG_INET_ECN=y
>
> Here's what the kernel configuration help has to say:
>
>   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.
>
> Shawn Starr wrote:
> >
> > Here's something strange that i've been noticing with 2.4.0. Some websites I am
> > unable to access now. For example:
> >
> > http://www.scotiabank.ca/simplify/index.html
>
> <snip>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Re: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Stefan Smietanowski]

Hi.

> Here's something strange that i've been noticing with 2.4.0. Some websites I am
> unable to access now. For example:

<snip about sites>

This is a FAQ. Check if you compiled with ECN enabled (CONFIG_INET_ECN).
Some sites have broken firewalls that drop packets of that type. Either
don't surf to those sites or disable ECN. This will all work when all
sites upgrade their firewalls *cough*.

// Stefan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

Re: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o

[Mike A. Harris]

On Fri, 12 Jan 2001, Shawn Starr wrote:

Snoop through /proc, and you'll find a file where you can disable
"ecn" support.

echo 0 > /proc....



>Date: Fri, 12 Jan 2001 16:37:35 -0500
>From: Shawn Starr <Shawn.Starr@Home.net>
>To: Donald Becker <becker@scyld.com>, vortex@scyld.com,
>     linux-kernel@vger.kernel.org
>Content-Type: text/plain; charset=iso-8859-15
>Subject: [PROBLEM]: Strange network problems with 2.4.0 and 3c59x.o
>
>Here's something strange that i've been noticing with 2.4.0. Some websites I am
>unable to access now. For example:
>
>http://www.scotiabank.ca/simplify/index.html
>
>if your in Canada and you have Scotia banking online, try and access their
>banking sites. It will just hang. However upon trying the same in Windows 2000
>(cough). The site works fine.
>
>Could there be a network driver issue as even trying with telnet port 80 fails
>as well?
>
>Im not sure on this one this seems bizarre. I have the same problem with
>www.workopolis.com, theglobeandmail.com, perhaps there's some sort of packet or
>frame not being processed properly?
>
>I can ICMP ping all the sites fine and i can access them from other shells.
>I have spoken to some of their engineers and they say that there is nothing
>blocking/no firewalls configured to deny access to theses sites.
>
>If there's any information you need I'd be glad to try and figure this one out.
>
>Shawn S.
>
>
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>the body of a message to majordomo@vger.kernel.org
>Please read the FAQ at http://www.tux.org/lkml/
>



----------------------------------------------------------------------
    Mike A. Harris  -  Linux advocate  -  Free Software advocate
          This message is copyright 2001, all rights reserved.
  Views expressed are my own, not necessarily shared by my employer.
----------------------------------------------------------------------

VMS is a text-only adventure game. If you win you can use unix.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/