Re: [tcpm] Fwd: Re: Data on 'Nonce' and 'Broken' responses to AccECN SYN?

"Scharf, Michael (Nokia - DE/Stuttgart)" <michael.scharf@nokia.com> Wed, 18 July 2018 13:24 UTC

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From: "Scharf, Michael (Nokia - DE/Stuttgart)" <michael.scharf@nokia.com>
To: Bob Briscoe <ietf@bobbriscoe.net>
CC: ANNA MARIA MANDALARI <amandala@it.uc3m.es>, tcpm IETF list <tcpm@ietf.org>
Thread-Topic: [tcpm] Fwd: Re: Data on 'Nonce' and 'Broken' responses to AccECN SYN?
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Date: Wed, 18 Jul 2018 13:24:47 +0000
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Subject: Re: [tcpm] Fwd: Re: Data on 'Nonce' and 'Broken' responses to AccECN SYN?
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Interesting. So what prevents us from reserving the nonce pattern for future use?

Michael


From: tcpm [mailto:tcpm-bounces@ietf.org] On Behalf Of Bob Briscoe
Sent: Wednesday, July 18, 2018 1:41 PM
To: Michael Scharf <michael.scharf@gmail.com>
Cc: ANNA MARIA MANDALARI <amandala@it.uc3m.es>es>; tcpm IETF list <tcpm@ietf.org>
Subject: [tcpm] Fwd: Re: Data on 'Nonce' and 'Broken' responses to AccECN SYN?

Michael,

Below is data from 410,803 of the Alexa top 500k web server that confirms what I said in the presentation about space for future evolution of AccECN:

  *   the nonce pattern on the SYN-ACK could be reused now (0.0007%)
  *   the broken reflection pattern is still far too prevalent to re-use it (0.35%).
If anyone wants the list of broken servers that Anna attached for me, pls ask.
The whole dataset is also available via: http://www.it.uc3m.es/amandala/ecn++/

@Anna, thanks v much for responding so quickly - it was me that hadn't read your email in time for the talk.



Bob

-------- Forwarded Message --------
Subject:

Re: Data on 'Nonce' and 'Broken' responses to AccECN SYN?

Date:

Tue, 17 Jul 2018 15:42:10 +0200

From:

ANNA MARIA MANDALARI <amandala@it.uc3m.es><mailto:amandala@it.uc3m.es>

To:

Bob Briscoe <research@bobbriscoe.net><mailto:research@bobbriscoe.net>


Hi Bob,

I had a look at the data and I found 1,438 servers over the top 410,803 Alexa (0.35%) that reply SYN/ACK+111 to a SYN+111 (attached the list).

Only 3 servers (0.0007%) reply SYN/ACK+101 to a SYN+111:

test_synack;200.12.171.53;80;ect;0;flags;338
test_synack;60.28.220.134;80;ect;0;flags;338
test_synack;200.12.171.52;80;ect;0;flags;338

Let me know if I can help you with something else!






2018-07-17 13:26 GMT+02:00 Bob Briscoe <research@bobbriscoe.net<mailto:research@bobbriscoe.net>>:
Anna,

Could you do me a favour and look up how many servers responded to an AccECN (111) SYN with a SYN/ACK carrying respectively 'Nonce' (101) or 'Broken' (111)?

And also the total number of tests sent with an AccECN SYN, so I can give proportions in the AccECN draft.

Cheers



Bob (too lazy to look at the data myself)

--
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/



--
ANNA MARIA MANDALARI
Universidad Carlos III de Madrid