[e2e] IGNORE POST -- Re: TCP sequence number reset

[Joe Touch]

Hi, Lloyd,

Oh - yes, that's possible.

To all on the list, please ignore the post as a result.

Joe (as list admin)

On 10/11/2011 10:23 AM, L.Wood at surrey.ac.uk wrote:
> Joe,
>
> the email below is an exact copy of a mail in the archives:
> http://mailman.postel.org/pipermail/end2end-interest/2011-March/008130.html
>
> I wonder if this is a sophisticated spam attack, to allow propagation
> of the url in the signature. (Billige Flüge - cheap flights.)
>
>
>> -----Original Message-----
>> From: end2end-interest-bounces at postel.org
>> [mailto:end2end-interest-bounces at postel.org] On Behalf Of Joe Touch
>> Sent: 11 October 2011 17:03
>> To: Kristen Eisenberg
>> Cc: end2end-interest at postel.org
>> Subject: Re: [e2e] TCP sequence number reset
>>
>> Hi, Kristen,
>>
>> On 10/10/2011 3:45 AM, Kristen Eisenberg wrote:
>>> Just want to get some opinion from the list members about an idea
>>> proposed in an IETF draft. The equivalent idea when applied
>> to TCP is
>>> sequence number reset. The idea is that assuming an application can
>>> access TCP sequence number with each byte of data, an app
>> is allowed
>>> to reset the TCP sequence number when it wants to. The
>> sequence number
>>> is set to a number not acceptable (add 231) in the current
>> connection.
>>> Note that there is no clear usage proposed in that draft nor any
>>> reason that it is needed, just a mechanism to do it. I want to see
>>> whether folks on this list think that it is a good or bad idea?
>>> And why?
>>
>> There was a long thread on this topic on this list; check the
>> archives starting March 24, 2011.
>>
>> My view of the conclusion - bad idea. TCP has only one
>> stateful handshake - during connection establishment.
>> Resetting the numbers requires a stateful handshake in the
>> middle of a connection, which TCP doesn't support. Adding a
>> mechanism to do so is as much work as starting a new TCP
>> connection, if not more.
>>
>> Joe
>>
>>
>>> Kristen Eisenberg
>>> Billige Flüge
>>> Marketing GmbH
>>> Emanuelstr. 3,
>>> 10317 Berlin
>>> Deutschland
>>> Telefon: +49 (33)
>>> 5310967
>>> Email:
>>> utebachmeier at
>>> gmail.com