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SubjectRe: IP ID == 0 ?!
   Date: 	Thu, 14 Dec 2000 04:11:09 +0100
From: Ivan Vadovic <>

I've been having weird problems with 2.4 kernels ip networking. I
can't connect to several sites (, ). 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

David S. Miller
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