[Tsvwg] update on ECN
Sally Floyd <floyd@aciri.org> Sat, 04 November 2000 22:41 UTC
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From: Sally Floyd <floyd@aciri.org>
Date: Sat, 04 Nov 2000 14:32:27 -0800
Subject: [Tsvwg] update on ECN
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KK and I have submitted a new internet draft on "TCP with ECN: The Treatment of Retransmitted Data Packets". This specifies that the TCP data sender should not set the ECT bit on retransmitted packets, for greater robustness against denial of service attacks. A local copy of the draft is available at: http://www.aciri.org/floyd/papers/draft-ietf-tsvwg-tcp-ecn-00.txt or: http://www.aciri.org/floyd/papers/draft-ietf-tsvwg-tcp-ecn-00.ps We would welcome any feedback on this. This will be discussed at the TSVWG at the San Diego IETF. Any discussion of this draft should take place on the TSVWG mailing list. We have also talked with Scott Bradner and Allison Mankin, the Transport Area ADs, and they are agreed that it is time to put all of the ECN material into a single internet-draft, and then last-call that document for Proposed Standard. So hopefully we will soon have a single internet-draft incorporating RFC 2481, the relevant new language from draft-ietf-tsvwg-tcp-ecn-00.txt, and some paragraphs about SYN and SYN-ACK packets, into a single internet-draft to submit for Proposed Standard. Many thanks, - Sally -------------------------------- http://www.aciri.org/floyd/ -------------------------------- Abstract of draft-ietf-tsvwg-tcp-ecn-00.txt: This document makes recommendations for the use of ECN with retransmitted data packets, for an ECN-capable TCP connection. This document supplements RFC 2481 [RFC2481], which did not address the issue of retransmitted data packets. This document recommends that for ECN-capable TCP implementations, the ECT bit (ECN-Capable Transport) in the IP header SHOULD NOT be set on retransmitted data packets, and that the TCP data receiver SHOULD ignore the ECN field on arriving data packets that are outside of the receiver's current window. This is for greater security against denial-of-service attacks. In addition, this document recommends that the CWR bit (Congestion Window Reduced) in the TCP header SHOULD NOT be set on retransmitted packets. When the TCP data sender is ready to set the CWR bit after reducing the congestion window, it SHOULD set the CWR bit on the first new data packet that it transmits. ------- End of Forwarded Message _______________________________________________ tsvwg mailing list tsvwg@ietf.org http://www1.ietf.org/mailman/listinfo/tsvwg
- [Tsvwg] update on ECN Sally Floyd