[e2e] TCP sequence number reset

[L.Wood@surrey.ac.uk]

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
> > Site:
> > http://flug.airego.de - Billige Flüge vergleichen
>