IP ID == 0 ?!

IP ID == 0 ?!

[Ivan Vadovic]

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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Re: IP ID == 0 ?!

[David S. Miller]

   Date: 	Thu, 14 Dec 2000 04:11:09 +0100
   From: Ivan Vadovic <pivo@pobox.sk>

   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
davem@redhat.com
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Re: IP ID == 0 ?!

[adrian]

Hello,

On Thu, 14 Dec 2000, Ivan Vadovic wrote:

> Hi,
[snip]
> help here. Did I forget to configure something?

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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