NDT-DEV email list created

Status: New
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Labels: Type-Defect Severity-Medium

New issue 31 by Garimella.Srinivasu: Explicit congestion notification (ECN)  
option is shown always OFF in statistics window.
http://code.google.com/p/ndt/issues/detail?id=31

What steps will reproduce the problem?
1.Set the ECN option field as “ON” in client using the below command.
    sudo echo "1" > /proc/sys/net/ipv4/tcp_ecn
2.check the ECN option field is setted to  “ON” or not using the below  
command.
    sudo cat /proc/sys/net/ipv4/tcp_ecn
3.Set the ECN option field as “ON” in server using the below command.
    sudo echo "1" > /proc/sys/net/ipv4/tcp_ecn
4.check the ECN option field is setted to “ON” or not in server using the
below command.
    sudo cat /proc/sys/net/ipv4/tcp_ecn
5.Open the browser with server address.
6.start the test by clicking the “Start” button
7.after completion of the test, open the statisticks window and check the
status of “Explicit Congestion Notification” information.

What is the expected output? What do you see instead?
Expected Output:
Explicit Congestion Notification option should be display as “ON”.


Observed Output:
Explicit Congestion Notification option always displaying “OFF”.

We have observed in tcpdump that ECT(1) (ECN Capable Transport(1) is setted
in IP header and ECE flag - ECN-Echo flag & CWR flag setted in tcp packet.
TCP dump is attached.



Attachments:
        ECN option.png  173 KB
        ecn_tcpdump.txt  29.1 KB

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