Network Working Group M. Allman Internet-Draft V. Paxson Expires: August 2007 ICIR / ICSI E. Blanton Purdue University February 2007 TCP Congestion Control draft-ietf-tcpm-rfc2581bis-02.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Copyright Notice Copyright (C) The Internet Society (2007). Abstract This document defines TCP's four intertwined congestion control algorithms: slow start, congestion avoidance, fast retransmit, and fast recovery. In addition, the document specifies how TCP should begin transmission after a relatively long idle period, as well as discussing various acknowledgment generation methods. 1. Introduction This document specifies four TCP [RFC793] congestion control algorithms: slow start, congestion avoidance, fast retransmit and fast recovery. These algorithms were devised in [Jac88] and [Jac90]. Their use with TCP is standardized in [RFC1122]. Additional early work in additive-increase, multiplicative-decrease congestion control is given in [CJ89]. Expires: August 2007 [Page 1] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 This document obsoletes [RFC2581] which in turned obsoleted [RFC2001]. In addition to specifying the congestion control algorithms, this document specifies what TCP connections should do after a relatively long idle period, as well as specifying and clarifying some of the issues pertaining to TCP ACK generation. Note that [Ste94] provides examples of these algorithms in action and [WS95] provides an explanation of the source code for the BSD implementation of these algorithms. This document is organized as follows. Section 2 provides various definitions which will be used throughout the document. Section 3 provides a specification of the congestion control algorithms. Section 4 outlines concerns related to the congestion control algorithms and finally, section 5 outlines security considerations. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Definitions This section provides the definition of several terms that will be used throughout the remainder of this document. SEGMENT: A segment is ANY TCP/IP data or acknowledgment packet (or both). SENDER MAXIMUM SEGMENT SIZE (SMSS): The SMSS is the size of the largest segment that the sender can transmit. This value can be based on the maximum transmission unit of the network, the path MTU discovery [RFC1191] algorithm, RMSS (see next item), or other factors. The size does not include the TCP/IP headers and options. RECEIVER MAXIMUM SEGMENT SIZE (RMSS): The RMSS is the size of the largest segment the receiver is willing to accept. This is the value specified in the MSS option sent by the receiver during connection startup. Or, if the MSS option is not used, 536 bytes [RFC1122]. The size does not include the TCP/IP headers and options. FULL-SIZED SEGMENT: A segment that contains the maximum number of data bytes permitted (i.e., a segment containing SMSS bytes of data). RECEIVER WINDOW (rwnd): The most recently advertised receiver window. CONGESTION WINDOW (cwnd): A TCP state variable that limits the amount of data a TCP can send. At any given time, a TCP MUST Expires: August 2007 [Page 2] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 NOT send data with a sequence number higher than the sum of the highest acknowledged sequence number and the minimum of cwnd and rwnd. INITIAL WINDOW (IW): The initial window is the size of the sender's congestion window after the three-way handshake is completed. LOSS WINDOW (LW): The loss window is the size of the congestion window after a TCP sender detects loss using its retransmission timer. RESTART WINDOW (RW): The restart window is the size of the congestion window after a TCP restarts transmission after an idle period (if the slow start algorithm is used; see section 4.1 for more discussion). FLIGHT SIZE: The amount of data that has been sent but not yet acknowledged. DUPLICATE ACKNOWLEDGMENT: An acknowledgment is considered a "duplicate" in the following algorithms when (a) the receiver of the ACK has outstanding data, (b) the incoming acknowledgment carries no data, (c) the SYN and FIN bits are both off, (d) the acknowledgment number is equal to the greatest acknowledgment received on the given connection (TCP.UNA from [RFC793]) and (e) the advertised window in the incoming acknowledgment equals the advertised window in the last incoming acknowledgment. Alternatively, a TCP that utilizes selective acknowledgments [RFC2018,RFC2883] can determine an incoming ACK is a "duplicate" if the ACK contains previously unknown SACK information. 3. Congestion Control Algorithms This section defines the four congestion control algorithms: slow start, congestion avoidance, fast retransmit and fast recovery, developed in [Jac88] and [Jac90]. In some situations it may be beneficial for a TCP sender to be more conservative than the algorithms allow, however a TCP MUST NOT be more aggressive than the following algorithms allow (that is, MUST NOT send data when the value of cwnd computed by the following algorithms would not allow the data to be sent). 3.1 Slow Start and Congestion Avoidance The slow start and congestion avoidance algorithms MUST be used by a TCP sender to control the amount of outstanding data being injected into the network. To implement these algorithms, two variables are added to the TCP per-connection state. The congestion window (cwnd) is a sender-side limit on the amount of data the sender can transmit into the network before receiving an acknowledgment (ACK), while the receiver's advertised window (rwnd) is a receiver-side limit on the amount of outstanding data. The minimum of cwnd and rwnd governs data transmission. Expires: August 2007 [Page 3] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 Another state variable, the slow start threshold (ssthresh), is used to determine whether the slow start or congestion avoidance algorithm is used to control data transmission, as discussed below. Beginning transmission into a network with unknown conditions requires TCP to slowly probe the network to determine the available capacity, in order to avoid congesting the network with an inappropriately large burst of data. The slow start algorithm is used for this purpose at the beginning of a transfer, or after repairing loss detected by the retransmission timer. IW, the initial value of cwnd, MUST be set using the following guidelines as an upper bound. If SMSS > 2190 bytes: IW = 2 * SMSS bytes and MUST NOT be more than 2 segments If (SMSS > 1095 bytes) and (SMSS <= 2190 bytes): IW = 3 * SMSS bytes and MUST NOT be more than 3 segments if SMSS <= 1095 bytes: IW = 4 * SMSS bytes and MUST NOT be more than 4 segments As specified in [RFC3390], the SYN/ACK and the acknowledgment of the SYN/ACK MUST NOT increase the size of the congestion window. Further, if the SYN or SYN/ACK is lost, the initial window used by a sender after a correctly transmitted SYN MUST be one segment consisting of at most SMSS bytes. A detailed rationale and discussion of the IW setting is provided in [RFC3390]. When larger initial windows are implemented along with Path MTU Discovery [RFC1191], and the MSS being used is found to be too large, the congestion window cwnd SHOULD be reduced to prevent large bursts of smaller segments. Specifically, cwnd SHOULD be reduced by the ratio of the old segment size to the new segment size. The initial value of ssthresh SHOULD be set arbitrarily high (e.g., to the size of the largest possible advertised window), but ssthresh MUST be reduced in response to congestion. Setting ssthresh as high as possible allows the network conditions, rather than some arbitrary host limit, to dictate the sending rate. In cases where the end systems have a solid understanding of the network path, more carefully setting the initial ssthresh value may have merit (e.g., such that the end host does not create congestion along the path). The slow start algorithm is used when cwnd < ssthresh, while the congestion avoidance algorithm is used when cwnd > ssthresh. When cwnd and ssthresh are equal the sender may use either slow start or congestion avoidance. During slow start, a TCP increments cwnd by at most SMSS bytes for each ACK received that acknowledges new data. Slow start ends when cwnd exceeds ssthresh (or, optionally, when it reaches it, as noted Expires: August 2007 [Page 4] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 above) or when congestion is observed. While traditionally TCP implementations have increased cwnd by precisely SMSS bytes upon receipt of an ACK covering new data, we RECOMMEND that TCP implementations increase cwnd, per: cwnd += min (N, SMSS) (2) where N is the number of previously unacknowledged bytes acknowledged in the incoming ACK. This adjustment is part of Appropriate Byte Counting [RFC3465] and provides robustness against misbehaving receivers which may attempt to induce a sender to artificially inflate cwnd using a mechanism known as "ACK Division" [SCWA99]. ACK Division consists of a receiver sending multiple ACKs for a single TCP data segment, each acknowledging only a portion of its data. A TCP that increments cwnd by SMSS for each such ACK will inappropriately inflate the amount of data injected into the network. During congestion avoidance, cwnd is incremented by roughly 1 full-sized segment per round-trip time (RTT). Congestion avoidance continues until congestion is detected. The basic guidelines for incrementing cwnd during congestion avoidance are: * MAY increment cwnd by SMSS bytes * SHOULD increment cwnd per equation (2) * MUST NOT increment cwnd by more than SMSS bytes We note that [RFC3465] allows for cwnd increases of more than SMSS bytes for incoming acknowledgments during slow start on an experimental basis, however such behavior is not allowed as part of the standard. The RECOMMENDED way to increase cwnd during congestion avoidance is to count the number of bytes that have been acknowledged by ACKs for new data. (A drawback of this implementation is that it requires maintaining an additional state variable.) When the number of bytes acknowledged reaches cwnd, then cwnd can be incremented by up to SMSS bytes. Note that during congestion avoidance, cwnd MUST NOT be increased by more than SMSS bytes per RTT. This method both allows TCPs to increase cwnd by one segment per RTT in the face of delayed ACKs and provides robustness against ACK Division attacks. Another common formula that a TCP MAY use to update cwnd during congestion avoidance is given in equation 3: cwnd += SMSS*SMSS/cwnd (3) This adjustment is executed on every incoming ACK that acknowledges new data. Equation (3) provides an acceptable approximation to the underlying principle of increasing cwnd by 1 full-sized segment per RTT. (Note that for a connection in which the receiver is acknowledging Expires: August 2007 [Page 5] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 every-other packet, (3) is less aggressive than allowed -- roughly increasing cwnd every second RTT.) Implementation Note: Since integer arithmetic is usually used in TCP implementations, the formula given in equation 3 can fail to increase cwnd when the congestion window is larger than SMSS*SMSS. If the above formula yields 0, the result SHOULD be rounded up to 1 byte. Implementation Note: Older implementations have an additional additive constant on the right-hand side of equation (3). This is incorrect and can actually lead to diminished performance [RFC2525]. Implementation Note: Some implementations maintain cwnd in units of bytes, while others in units of full-sized segments. The latter will find equation (3) difficult to use, and may prefer to use the counting approach discussed in the previous paragraph. When a TCP sender detects segment loss using the retransmission timer and the given segment has not yet been retransmitted, the value of ssthresh MUST be set to no more than the value given in equation 4: ssthresh = max (FlightSize / 2, 2*SMSS) (4) where, as discussed above, FlightSize is the amount of outstanding data in the network. On the other hand, when a TCP sender detects segment loss using the retransmission timer and the given segment has already been retransmitted at least once, the value of ssthresh is held constant. Implementation Note: An easy mistake to make is to simply use cwnd, rather than FlightSize, which in some implementations may incidentally increase well beyond rwnd. Furthermore, upon a timeout (as specified in [RFC2988]) cwnd MUST be set to no more than the loss window, LW, which equals 1 full-sized segment (regardless of the value of IW). Therefore, after retransmitting the dropped segment the TCP sender uses the slow start algorithm to increase the window from 1 full-sized segment to the new value of ssthresh, at which point congestion avoidance again takes over. As shown in [FF96,RFC3782], slow start-based loss recovery after a timeout can cause spurious retransmissions that trigger duplicate acknowledgments. The reaction to the arrival of these duplicate ACKs in TCP implementations varies widely. This document does not specify how to treat such acknowledgments, but does note this as an area that may benefit from additional attention, experimentation and specification. 3.2 Fast Retransmit/Fast Recovery Expires: August 2007 [Page 6] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 A TCP receiver SHOULD send an immediate duplicate ACK when an out- of-order segment arrives. The purpose of this ACK is to inform the sender that a segment was received out-of-order and which sequence number is expected. From the sender's perspective, duplicate ACKs can be caused by a number of network problems. First, they can be caused by dropped segments. In this case, all segments after the dropped segment will trigger duplicate ACKs until the loss is repaired. Second, duplicate ACKs can be caused by the re-ordering of data segments by the network (not a rare event along some network paths [Pax97]). Finally, duplicate ACKs can be caused by replication of ACK or data segments by the network. In addition, a TCP receiver SHOULD send an immediate ACK when the incoming segment fills in all or part of a gap in the sequence space. This will generate more timely information for a sender recovering from a loss through a retransmission timeout, a fast retransmit, or an advanced loss recovery algorithm, as outlined in section 4.3. The TCP sender SHOULD use the "fast retransmit" algorithm to detect and repair loss, based on incoming duplicate ACKs. The fast retransmit algorithm uses the arrival of 3 duplicate ACKs (as defined in section 2, without any intervening ACKs which move SND.UNA) as an indication that a segment has been lost. After receiving 3 duplicate ACKs, TCP performs a retransmission of what appears to be the missing segment, without waiting for the retransmission timer to expire. After the fast retransmit algorithm sends what appears to be the missing segment, the "fast recovery" algorithm governs the transmission of new data until a non-duplicate ACK arrives. The reason for not performing slow start is that the receipt of the duplicate ACKs not only indicates that a segment has been lost, but also that segments are most likely leaving the network (although a massive segment duplication by the network can invalidate this conclusion). In other words, since the receiver can only generate a duplicate ACK when a segment has arrived, that segment has left the network and is in the receiver's buffer, so we know it is no longer consuming network resources. Furthermore, since the ACK "clock" [Jac88] is preserved, the TCP sender can continue to transmit new segments (although transmission must continue using a reduced cwnd, since loss is an indication of congestion). The fast retransmit and fast recovery algorithms are implemented together as follows. 1. On the first and second duplicate ACKs received at a sender, a TCP SHOULD send a segment of previously unsent data per [RFC3042] provided that the receiver's advertised window allows, the total FlightSize would remain less than or equal to cwnd plus 2*SMSS, and that new data is available for transmission. Further, the TCP sender MUST NOT change cwnd to reflect these two segments [RFC3042]. Note that a sender using SACK [RFC2018] MUST NOT send new data unless the incoming duplicate acknowledgment contains new SACK information. Expires: August 2007 [Page 7] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 2. When the third duplicate ACK is received, a TCP MUST set ssthresh to no more than the value given in equation 4. 3. The lost segment MUST be retransmitted and cwnd set to ssthresh plus 3*SMSS. This artificially "inflates" the congestion window by the number of segments (three) that have left the network and which the receiver has buffered. 4. For each additional duplicate ACK received (after the third), cwnd MUST be incremented by SMSS. This artificially inflates the congestion window in order to reflect the additional segment that has left the network. Note: [SCWA99] discusses a receiver-based attack whereby many bogus duplicate ACKs are sent to the data sender in order to artificially inflate cwnd and cause a higher than appropriate sending rate to be used. A TCP MAY therefore limit the number of times cwnd is artificially inflated during loss recovery to the number of outstanding segments (or, an approximation thereof). 5. Transmit a segment, if allowed by the new value of cwnd and the receiver's advertised window. 6. When the next ACK arrives that acknowledges previously unacknowledged data, a TCP MUST set cwnd to ssthresh (the value set in step 2). This is termed "deflating" the window. This ACK should be the acknowledgment elicited by the retransmission from step 3, one RTT after the retransmission (though it may arrive sooner in the presence of significant out- of-order delivery of data segments at the receiver). Additionally, this ACK should acknowledge all the intermediate segments sent between the lost segment and the receipt of the third duplicate ACK, if none of these were lost. Note: This algorithm is known to generally not recover efficiently from multiple losses in a single flight of packets [FF96]. Section 4.3 below addresses such cases. 4. Additional Considerations 4.1 Re-starting Idle Connections A known problem with the TCP congestion control algorithms described above is that they allow a potentially inappropriate burst of traffic to be transmitted after TCP has been idle for a relatively long period of time. After an idle period, TCP cannot use the ACK clock to strobe new segments into the network, as all the ACKs have drained from the network. Therefore, as specified above, TCP can potentially send a cwnd-size line-rate burst into the network after an idle period. Expires: August 2007 [Page 8] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 [Jac88] recommends that a TCP use slow start to restart transmission after a relatively long idle period. Slow start serves to restart the ACK clock, just as it does at the beginning of a transfer. This mechanism has been widely deployed in the following manner. When TCP has not received a segment for more than one retransmission timeout, cwnd is reduced to the value of the restart window (RW) before transmission begins. For the purposes of this standard, we define RW = min(IW,cwnd). Using the last time a segment was received to determine whether or not to decrease cwnd can fail to deflate cwnd in the common case of persistent HTTP connections [HTH98]. In this case, a Web server receives a request before transmitting data to the Web client. The reception of the request makes the test for an idle connection fail, and allows the TCP to begin transmission with a possibly inappropriately large cwnd. Therefore, a TCP SHOULD set cwnd to no more than RW before beginning transmission if the TCP has not sent data in an interval exceeding the retransmission timeout. 4.2 Generating Acknowledgments The delayed ACK algorithm specified in [RFC1122] SHOULD be used by a TCP receiver. When using delayed ACKs, a TCP receiver MUST NOT excessively delay acknowledgments. Specifically, an ACK SHOULD be generated for at least every second full-sized segment, and MUST be generated within 500 ms of the arrival of the first unacknowledged packet. The requirement that an ACK "SHOULD" be generated for at least every second full-sized segment is listed in [RFC1122] in one place as a SHOULD and another as a MUST. Here we unambiguously state it is a SHOULD. We also emphasize that this is a SHOULD, meaning that an implementor should indeed only deviate from this requirement after careful consideration of the implications. See the discussion of "Stretch ACK violation" in [RFC2525] and the references therein for a discussion of the possible performance problems with generating ACKs less frequently than every second full-sized segment. In some cases, the sender and receiver may not agree on what constitutes a full-sized segment. An implementation is deemed to comply with this requirement if it sends at least one acknowledgment every time it receives 2*RMSS bytes of new data from the sender, where RMSS is the Maximum Segment Size specified by the receiver to the sender (or the default value of 536 bytes, per [RFC1122], if the receiver does not specify an MSS option during connection establishment). The sender may be forced to use a segment size less than RMSS due to the maximum transmission unit (MTU), the path MTU discovery algorithm or other factors. For instance, consider the case when the receiver announces an RMSS of X bytes but the sender ends up using a segment size of Y bytes (Y < X) due to path MTU discovery (or the sender's MTU size). The receiver will generate Expires: August 2007 [Page 9] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 stretch ACKs if it waits for 2*X bytes to arrive before an ACK is sent. Clearly this will take more than 2 segments of size Y bytes. Therefore, while a specific algorithm is not defined, it is desirable for receivers to attempt to prevent this situation, for example by acknowledging at least every second segment, regardless of size. Finally, we repeat that an ACK MUST NOT be delayed for more than 500 ms waiting on a second full-sized segment to arrive. Out-of-order data segments SHOULD be acknowledged immediately, in order to accelerate loss recovery. To trigger the fast retransmit algorithm, the receiver SHOULD send an immediate duplicate ACK when it receives a data segment above a gap in the sequence space. To provide feedback to senders recovering from losses, the receiver SHOULD send an immediate ACK when it receives a data segment that fills in all or part of a gap in the sequence space. A TCP receiver MUST NOT generate more than one ACK for every incoming segment, other than to update the offered window as the receiving application consumes new data [page 42, RFC793][RFC813]. 4.3 Loss Recovery Mechanisms A number of loss recovery algorithms that augment fast retransmit and fast recovery have been suggested by TCP researchers and specified in the RFC series. While some of these algorithms are based on the TCP selective acknowledgment (SACK) option [RFC2018], such as [FF96,MM96a,MM96b,RFC3517], others do not require SACKs [Hoe96,FF96,RFC3782]. The non-SACK algorithms use "partial acknowledgments" (ACKs which cover previously unacknowledged data, but not all the data outstanding when loss was detected) to trigger retransmissions. While this document does not standardize any of the specific algorithms that may improve fast retransmit/fast recovery, these enhanced algorithms are implicitly allowed, as long as they follow the general principles of the basic four algorithms outlined above. That is, when the first loss in a window of data is detected, ssthresh MUST be set to no more than the value given by equation (4). Second, until all lost segments in the window of data in question are repaired, the number of segments transmitted in each RTT MUST be no more than half the number of outstanding segments when the loss was detected. Finally, after all loss in the given window of segments has been successfully retransmitted, cwnd MUST be set to no more than ssthresh and congestion avoidance MUST be used to further increase cwnd. Loss in two successive windows of data, or the loss of a retransmission, should be taken as two indications of congestion and, therefore, cwnd (and ssthresh) MUST be lowered twice in this case. We RECOMMEND that TCP implementers employ some form of advanced loss recovery that can cope with multiple losses in a window of data. The algorithms detailed in [RFC3782] and [RFC3517] conform to the general principles outlined above. We note that while these are not the only two algorithms that conform to the above general principles Expires: August 2007 [Page 10] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 these two algorithms have been vetted by the community and are currently on the standards track. 5. Security Considerations This document requires a TCP to diminish its sending rate in the presence of retransmission timeouts and the arrival of duplicate acknowledgments. An attacker can therefore impair the performance of a TCP connection by either causing data packets or their acknowledgments to be lost, or by forging excessive duplicate acknowledgments. Causing two congestion control events back-to-back will often cut ssthresh to its minimum value of 2*SMSS, causing the connection to immediately enter the slower-performing congestion avoidance phase. In response to the ACK division attack outlined in [SCWA99] this document RECOMMENDS increasing the congestion window based on the number of bytes newly acknowledged in each arriving ACK rather than by a particular constant on each arriving ACK (as outlined in section 3.1). The Internet to a considerable degree relies on the correct implementation of these algorithms in order to preserve network stability and avoid congestion collapse. An attacker could cause TCP endpoints to respond more aggressively in the face of congestion by forging excessive duplicate acknowledgments or excessive acknowledgments for new data. Conceivably, such an attack could drive a portion of the network into congestion collapse. 6. Changes Between RFC 2001 and RFC 2581 This document has been extensively rewritten editorially and it is not feasible to itemize the list of changes between the two documents. The intention of this document is not to change any of the recommendations given in RFC 2001, but to further clarify cases that were not discussed in detail in 2001. Specifically, this document suggests what TCP connections should do after a relatively long idle period, as well as specifying and clarifying some of the issues pertaining to TCP ACK generation. Finally, the allowable upper bound for the initial congestion window has also been raised from one to two segments. 7. Changes Relative to RFC 2581 A specific definition for "duplicate acknowledgment" has been added, based on the definition used by BSD TCP. The document now notes that what to do with duplicate ACKs after the retransmission timer has fired is future work and explicitly unspecified in this document. The initial window requirements were changed to allow Larger Initial Windows as standardized in [RFC3390]. Additionally, the steps to take when an initial window is discovered to be too large Expires: August 2007 [Page 11] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 due to Path MTU Discovery [RFC1191] are detailed. The recommended initial value for ssthresh has been changed to say that it SHOULD be arbitrarily high, where it was previously MAY. This is to provide additional guidance to implementors on the matter. During slow start, the usage of Appropriate Byte Counting [RFC3465] with L=1*SMSS is explicitly recommended. The method of increasing cwnd given in [RFC2581] is still explicitly allowed. Byte counting during congestion avoidance is also recommended, while the method from [RFC2581] and other safe methods are still allowed. The treatment of ssthresh on retransmission timeout was clarified. In particular, ssthresh must be set to half the FlightSize on the first retransmission of a given segment and then is held constant on subsequent retransmissions of the same segment. The description of fast retransmit and fast recovery has been clarified, and the use of Limited Transmit [RFC3042] is now recommended. TCPs now MAY limit the number of duplicate ACKs that artificially inflate cwnd during loss recovery to the number of segments outstanding to avoid the duplicate ACK spoofing attack described in [SCWA99]. The restart window has been changed to min(IW,cwnd) from IW. This behavior was described as "experimental" in [RFC2581]. It is now recommended that TCP implementors implement an advanced loss recovery algorithm conforming to the principles outlined in this document. The security considerations have been updated to discuss ACK division and recommend byte counting as a counter to this attack. Acknowledgments The core algorithms we describe were developed by Van Jacobson [Jac88, Jac90]. In addition, Limited Transmit [RFC3042] was developed in conjunction with Hari Balakrishnan and Sally Floyd. The initial congestion window size specified in this document is a result of work with Sally Floyd and Craig Partridge [RFC2414,RFC3390]. W. Richard ("Rich") Stevens wrote the first version of this document [RFC2001] and co-authored the second version [RFC2581]. This present version much benefits from his clarity and thoughtfulness of description, and we are grateful for Rich's contributions in elucidating TCP congestion control, as well as in more broadly helping us understand numerous issues relating to networking. We wish to emphasize that the shortcomings and mistakes of this Expires: August 2007 [Page 12] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 document are solely the responsibility of the current authors. Some of the text from this document is taken from "TCP/IP Illustrated, Volume 1: The Protocols" by W. Richard Stevens (Addison-Wesley, 1994) and "TCP/IP Illustrated, Volume 2: The Implementation" by Gary R. Wright and W. Richard Stevens (Addison- Wesley, 1995). This material is used with the permission of Addison-Wesley. Steve Arden, Neal Cardwell, Noritoshi Demizu, Kevin Fall, John Heffner, Alfred Hoenes, Sally Floyd, Reiner Ludwig, Matt Mathis, Craig Partridge and Joe Touch contributed a number of helpful suggestions. Normative References [RFC793] Postel, J., "Transmission Control Protocol", STD 7, RFC 793, September 1981. [RFC1122] Braden, R., "Requirements for Internet Hosts -- Communication Layers", STD 3, RFC 1122, October 1989. [RFC1191] Mogul, J. and S. Deering, "Path MTU Discovery", RFC 1191, November 1990. Informative References [CJ89] Chiu, D. and R. Jain, "Analysis of the Increase/Decrease Algorithms for Congestion Avoidance in Computer Networks", Journal of Computer Networks and ISDN Systems, vol. 17, no. 1, pp. 1-14, June 1989. [FF96] Fall, K. and S. Floyd, "Simulation-based Comparisons of Tahoe, Reno and SACK TCP", Computer Communication Review, July 1996. ftp://ftp.ee.lbl.gov/papers/sacks.ps.Z. [Flo94] Floyd, S., "TCP and Successive Fast Retransmits. Technical report", October 1994. ftp://ftp.ee.lbl.gov/papers/fastretrans.ps. [Hoe96] Hoe, J., "Improving the Start-up Behavior of a Congestion Control Scheme for TCP", In ACM SIGCOMM, August 1996. [HTH98] Hughes, A., Touch, J. and J. Heidemann, "Issues in TCP Slow-Start Restart After Idle", Work in Progress. [Jac88] Jacobson, V., "Congestion Avoidance and Control", Computer Communication Review, vol. 18, no. 4, pp. 314-329, Aug. 1988. ftp://ftp.ee.lbl.gov/papers/congavoid.ps.Z. [Jac90] Jacobson, V., "Modified TCP Congestion Avoidance Algorithm", end2end-interest mailing list, April 30, 1990. ftp://ftp.isi.edu/end2end/end2end-interest-1990.mail. Expires: August 2007 [Page 13] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 [MM96a] Mathis, M. and J. Mahdavi, "Forward Acknowledgment: Refining TCP Congestion Control", Proceedings of SIGCOMM'96, August, 1996, Stanford, CA. Available from http://www.psc.edu/networking/papers/papers.html [MM96b] Mathis, M. and J. Mahdavi, "TCP Rate-Halving with Bounding Parameters", Technical report. Available from http://www.psc.edu/networking/papers/FACKnotes/current. [Pax97] Paxson, V., "End-to-End Internet Packet Dynamics", Proceedings of SIGCOMM '97, Cannes, France, Sep. 1997. [RFC813] Clark, D., "Window and Acknowledgment Strategy in TCP", RFC 813, July 1982. [RFC2001] Stevens, W., "TCP Slow Start, Congestion Avoidance, Fast Retransmit, and Fast Recovery Algorithms", RFC 2001, January 1997. [RFC2018] Mathis, M., Mahdavi, J., Floyd, S. and A. Romanow, "TCP Selective Acknowledgement Options", RFC 2018, October 1996. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2414] Allman, M., Floyd, S. and C. Partridge, "Increasing TCP's Initial Window Size", RFC 2414, September 1998. [RFC2525] Paxson, V., Allman, M., Dawson, S., Fenner, W., Griner, J., Heavens, I., Lahey, K., Semke, J. and B. Volz, "Known TCP Implementation Problems", RFC 2525, March 1999. [RFC2581] Allman, M., Paxson, V., W. Stevens, TCP Congestion Control, RFC 2581, April 1999. [RFC2883] Floyd, S., J. Mahdavi, M. Mathis, M. Podolsky, An Extension to the Selective Acknowledgement (SACK) Option for TCP, RFC 2883, July 2000. [RFC2988] V. Paxson and M. Allman, "Computing TCP's Retransmission Timer", RFC 2988, November 2000. [RFC3042] Allman, M., Balakrishnan, H. and S. Floyd, "Enhancing TCP's Loss Recovery Using Limited Transmit", RFC 3042, January 2001. [RFC3390] Allman, M., Floyd, S., C. Partridge, "Increasing TCP's Initial Window", RFC 3390, October 2002. [RFC3465] Mark Allman, TCP Congestion Control with Appropriate Byte Counting (ABC), RFC 3465, February 2003. [RFC3517] Ethan Blanton, Mark Allman, Kevin Fall, Lili Wang, A Conservative Selective Acknowledgment (SACK)-based Loss Recovery Expires: August 2007 [Page 14] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 Algorithm for TCP, RFC 3517, April 2003. [RFC3782] Sally Floyd, Tom Henderson, Andrei Gurtov, The NewReno Modification to TCP's Fast Recovery Algorithm, RFC 3782, April 2004. [SCWA99] Savage, S., Cardwell, N., Wetherall, D., and T. Anderson, "TCP Congestion Control With a Misbehaving Receiver", ACM Computer Communication Review, 29(5), October 1999. [Ste94] Stevens, W., "TCP/IP Illustrated, Volume 1: The Protocols", Addison-Wesley, 1994. [WS95] Wright, G. and W. Stevens, "TCP/IP Illustrated, Volume 2: The Implementation", Addison-Wesley, 1995. Authors' Addresses Mark Allman ICIR / ICSI 1947 Center Street Suite 600 Berkeley, CA 94704-1198 Phone: +1 440 235 1792 EMail: mallman@icir.org http://www.icir.org/mallman/ Vern Paxson ICIR / ICSI 1947 Center Street Suite 600 Berkeley, CA 94704-1198 Phone: +1 510/642-4274 x302 EMail: vern@icir.org http://www.icir.org/vern/ Ethan Blanton Purdue University Computer Sciences 1398 Computer Science Building West Lafayette, IN 47907 EMail: eblanton@cs.purdue.edu http://www.cs.purdue.edu/homes/eblanton/ Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC Expires: August 2007 [Page 15] draft-ietf-tcpm-rfc2581bis-02.txt February 2007 documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Expires: August 2007 [Page 16]