Is IPv4 totally broken in 2.4-test

I have test9 running in an original Athlon 500, a PII 300, and a K6-2/400. All of them are experiencing the same problems with networking. I confimred that this is not happening to just my, as my buddy in a far away (California) land is experiencing the same thing. I cannot connect to ubid.com, landsend.com, etrade.com, travelocity.com, and a slew of others. I'm not sure if this is because all of those sites are going "Wow! His IP stack conforms to _STANDARDS_
- it must be fake" or what. However, it's really starting to get on my nerves.

All of the above boxes are based on SuSE 6.4. Using the latest modutils, binutils 2.10, and egcs-1.1.2 (Which I think is still compiler gratas) My buddy's box is a Mandrake 7.1 box. I know he was using gcc-2.95.2 and an old binutils, but he has changed to egcs-1.1.2 and a newer binutils. He's still having the same problem. I pretty sure it's not an iptables issue, since I believe that he has iptables off. I also tried no tables on my K6-2 box with the same effects.

Is anyone else experiencing these problems? Does anyone know if certain firewalls don't like 2.4 with a passion? Even better, does anyone know how to fix it?

BTW: I have narrowed this down to a 2.4 problem. If I load 2.2 on any of those machines on the same ISP it doesn't work.

Any ideas?

	-Carl Perry
	[email protected]

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

Or don't enable CONFIG_INET_ECN in your kernel configuration.

Later,
David S. Miller
[email protected]
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Duh. And here I was thinking that was a good thing. That did it. What exactly does "Explicit Congestion Notification" do? I figured it was going to put a message in syslog if the wire is full and packets were being dropped. There weren't any docs in menuconfig - so I figured "what the hey?". Boy - I was wrong. Thanks for the quick response. I haven't even gotten the post back yet.

	-Carl Perry
	[email protected]

"Real programmers don't draw flowcharts.  Flowcharts are, after
all, the illiterate's form of documentation.  Cavemen drew
flowcharts; look how much good it did them."
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if [ -f /proc/sys/net/ipv4/tcp_ecn ]
then

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

fi

or dont compile with ECN support int he kernel.

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Date: Mon, 30 Oct 2000 23:53:57 -0600
From: Carl Perry <[email protected]>

What exactly does "Explicit Congestion Notification" do?

It's a protocol extension by which routers can tell clients about the onset of congestion before the routers stops to drop that client's packets.

Unfortunately, a widely deployed firewall product made by Cisco and used at most of the large web sites block packets that make use of ECN. They have fixed the bug, but I honestly don't expect these sites to install the fix any time soon no matter how much the Cisco folks tell me that such sites are "likely to".

Later,
David S. Miller
[email protected]

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The sites are broken. They are running crap firewalls (often Cisco) that probably haven't been updated (or have no update available), and they see the (perfectly standards compliant) 'I support ECN' flag, think it must be something evil and drop the packet silently.

ECN is an important factor for the future scalability of the Internet. It allows for much smarter methods for congestion control. It's important that it get implemented, but these crappy firewalls are standing in the way. -
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