IP ID == 0 ?!

Hi,

I've been having weird problems with 2.4 kernels ip networking. I can't connect to several sites ( hotmail.com,intel.com... ). After some investigation with tcpdump I figured that the IDentification field of every outgoing ip packet is set to zero and then it doesn't get through some few firewalls. I'm surprised I haven't found anything about it in the list archives, so I'm trying to get help here. Did I forget to configure something?

Ivan Vadovic
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Date: Thu, 14 Dec 2000 04:11:09 +0100
From: Ivan Vadovic <[email protected]>

I've been having weird problems with 2.4 kernels ip networking. I can't connect to several sites ( hotmail.com,intel.com... ). After some investigation with tcpdump I figured that the IDentification field of every outgoing ip packet is set to zero and then it doesn't get through some few firewalls. I'm surprised I haven't found anything about it in the list archives, so I'm trying to get help here. Did I forget to configure something?

No, the sites have firewalls erroneously blocking ECN, try:

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

Later,
David S. Miller
[email protected]
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Hello,

[snip]

Did you configure IP: TCP Explicit Congestion Notification support? If so, this breaks some older firewalls, which probably won't be updated any time soon.

Regards,
Adrian

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