Re: Summary of responses so far and proposal moving forward[WasRe: [tcpm] Is this a problem?]
Joe Touch <touch@ISI.EDU> Wed, 28 November 2007 13:22 UTC
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Date: Wed, 28 Nov 2007 05:21:00 -0800
From: Joe Touch <touch@ISI.EDU>
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To: Mahesh Jethanandani <mahesh@cisco.com>
Subject: Re: Summary of responses so far and proposal moving forward[WasRe: [tcpm] Is this a problem?]
References: <20071126193803.585E12FC5BE@lawyers.icir.org> <61806008-0CBC-417D-B5EB-46A7EE18446F@windriver.com> <474CA683.2030600@cisco.com> <3EE5954A-5E50-4B1E-82BC-7A5FD55AEF1F@windriver.com> <474D1004.9030100@cisco.com>
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Mahesh Jethanandani wrote: ... > What I should have said is that the fact that the above statement in RFC > 1122 that "TCP MUST allow the connection to stay open" in response to > probes has caused a lot of confusion. We have opinions all the way from > it is ok for TCP to terminate the connection "in times of trouble" to it > is not for TCP to terminate any connection. We have had mails that have > said that it is ok for application/OS/socket layer to terminate the > connection but it is not ok for TCP to terminate the connection. Does it > mean that if socket interface makes a call to tcp_abort() to abort a > connection, that it is not TCP that is aborting the connection, but it > is socket interface that is, and therefore it is fine? > > Would it not help to clarify the statement in the rfc? It would be useful to clarify that in the Unix man pages for tcp_abort(), if there is in fact any real confusion in the Unix community on this issue. As Dave noted, RFC1122 is clear on the context of not aborting connections within TCP due to zero windows with active probes. The rest of this discussion has been addressing a moving target based on falsified claims of a vulnerability, which, as others have noted, is not more advantageous than many others in TCP, e.g., slowly draining buffers. It makes no sense to single out "victims" of this "attack" by "cleaning up" TCP state to save resources vs. any other mechanism to limit resource overuse (e.g., prohibiting new connections, deleting those with the largest socket buffers, etc.). The key issue is that a zero receive window with active probes is a valid, active TCP connection - as valid as any other in its use of resources. If we need a document to describe what to do in the event of resource overuse (and I don't think we do), the current document - and motivating threat - are notable only in how NOT to single out connections for resource recovery. Joe
_______________________________________________ tcpm mailing list tcpm@ietf.org https://www1.ietf.org/mailman/listinfo/tcpm
- [tcpm] Is this a problem? Mahesh Jethanandani
- RE: [tcpm] Is this a problem? Caitlin Bestler
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Florian Weimer
- Re: [tcpm] Is this a problem? John Heffner
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? speakeasy
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Lloyd Wood
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: [tcpm] Is this a problem? Ted Faber
- RE: [tcpm] Is this a problem? Caitlin Bestler
- Re: [tcpm] Is this a problem? John Heffner
- Re: [tcpm] Is this a problem? Mark Allman
- Re: [tcpm] Is this a problem? Mark Allman
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Mark Allman
- Re: [tcpm] Is this a problem? MURALI BASHYAM
- Re: [tcpm] Is this a problem? Mark Allman
- Re: [tcpm] Is this a problem? Lloyd Wood
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Mark Allman
- Re: [tcpm] Is this a problem? Chandrashekhar Appanna
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Chandrashekhar Appanna
- Re: [tcpm] Is this a problem? Mark Allman
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: [tcpm] Is this a problem? Lloyd Wood
- Re: [tcpm] Is this a problem? Lloyd Wood
- Re: [tcpm] Is this a problem? Joe Touch
- Re: [tcpm] Is this a problem? Lloyd Wood
- Re: [tcpm] Is this a problem? Jakob Heitz
- Re: [tcpm] Is this a problem? Ethan Blanton
- Re: [tcpm] Is this a problem? Chandrashekhar Appanna
- Re: [tcpm] Is this a problem? Ted Faber
- Re: [tcpm] Is this a problem? Ted Faber
- Summary of responses so far and proposal moving f… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… John Heffner
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Ted Faber
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Ted Faber
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… Joe Touch
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Tom Petch
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- RE: Summary of responses so far and proposal movi… Anantha Ramaiah (ananth)
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Mark Allman
- Re: Summary of responses so far and proposal movi… Mark Allman
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Mark Allman
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Mark Allman
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Mark Allman
- Re: Summary of responses so far and proposal movi… John Heffner
- Re: Summary of responses so far and proposal movi… Ted Faber
- Re: Summary of responses so far and proposal movi… Lloyd Wood
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… Lloyd Wood
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: Summary of responses so far and proposal movi… David Borman
- Re: Summary of responses so far and proposal movi… weddy
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Ethan Blanton
- Re: Summary of responses so far and proposal movi… Ethan Blanton
- Re: Summary of responses so far and proposal movi… David Borman
- Re: Summary of responses so far and proposal movi… Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Joe Touch
- Re: [tcpm] Is this a problem? Mahesh Jethanandani
- Re: Summary of responses so far and proposal movi… Erik Nordmark