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+Network Working Group                                           T. Koren
+Request for Comments: 3544                                 Cisco Systems
+Obsoletes: 2509                                                S. Casner
+Category: Standards Track                                  Packet Design
+                                                              C. Bormann
+                                                 Universitaet Bremen TZI
+                                                               July 2003
+
+
+                     IP Header Compression over PPP
+
+Status of this Memo
+
+   This document specifies an Internet standards track protocol for the
+   Internet community, and requests discussion and suggestions for
+   improvements.  Please refer to the current edition of the "Internet
+   Official Protocol Standards" (STD 1) for the standardization state
+   and status of this protocol.  Distribution of this memo is unlimited.
+
+Copyright Notice
+
+   Copyright (C) The Internet Society (2003).  All Rights Reserved.
+
+Abstract
+
+   This document describes an option for negotiating the use of header
+   compression on IP datagrams transmitted over the Point-to-Point
+   Protocol (RFC 1661).  It defines extensions to the PPP Control
+   Protocols for IPv4 and IPv6 (RFC 1332, RFC 2472).  Header compression
+   may be applied to IPv4 and IPv6 datagrams in combination with TCP,
+   UDP and RTP transport protocols as specified in RFC 2507, RFC 2508
+   and RFC 3545.
+
+1.  Introduction
+
+   The IP Header Compression (IPHC) defined in [RFC2507] may be used for
+   compression of both IPv4 and IPv6 datagrams or packets encapsulated
+   with multiple IP headers.  IPHC is also capable of compressing both
+   TCP and UDP transport protocol headers.  The IP/UDP/RTP header
+   compression defined in [RFC2508] and [RFC3545] fits within the
+   framework defined by IPHC so that it may also be applied to both IPv4
+   and IPv6 packets.
+
+
+
+
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 1]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   In order to establish compression of IP datagrams sent over a PPP
+   link each end of the link must agree on a set of configuration
+   parameters for the compression.  The process of negotiating link
+   parameters for network layer protocols is handled in PPP by a family
+   of network control protocols (NCPs).  Since there are separate NCPs
+   for IPv4 and IPv6, this document defines configuration options to be
+   used in both NCPs to negotiate parameters for the compression scheme.
+
+   This document obsoletes RFC 2509, adding two new suboptions to the IP
+   header compression configuration option.  One suboption negotiates
+   usage of Enhanced RTP-Compression (specified in [RFC3545]), and the
+   other suboption negotiates header compression for only TCP or only
+   non-TCP packets.
+
+   IPHC relies on the link layer's ability to indicate the types of
+   datagrams carried in the link layer frames.  In this document nine
+   new types for the PPP Data Link Layer Protocol Field are defined
+   along with their meaning.
+
+   In general, header compression schemes that use delta encoding of
+   compressed packets require that the lower layer does not reorder
+   packets between compressor and decompressor.  IPHC uses delta
+   encoding of compressed packets for TCP and RTP.  The IPHC
+   specification [RFC2507] includes methods that allow link layers that
+   may reorder packets to be used with IPHC.  Since PPP does not reorder
+   packets these mechanisms are disabled by default.  When using
+   reordering mechanisms such as multiclass multilink PPP [RFC2686],
+   care must be taken so that packets that share the same compression
+   context are not reordered.
+
+2.  Configuration Option
+
+   This document specifies a new compression protocol value for the IPCP
+   IP-Compression-Protocol option as specified in [RFC1332].  The new
+   value and the associated option format are described in section 2.1.
+
+   The option format is structured to allow future extensions to the
+   IPHC scheme.
+
+   NOTE: The specification of link and network layer parameter
+      negotiation for PPP [RFC1661], [RFC1331], [RFC1332] does not
+      prohibit multiple instances of one configuration option but states
+      that the specification of a configuration option must explicitly
+      allow multiple instances.  [RFC3241] updates RFC 1332 by
+      explicitly allowing the sending of multiple instances of the IP-
+      Compression-Protocol configuration option, each with a different
+      value for IP-Compression-Protocol.  Each type of compression
+      protocol may independently establish its own parameters.
+
+
+
+Koren, et al.               Standards Track                     [Page 2]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   NOTE: [RFC1332] is not explicit about whether the option
+      negotiates the capabilities of the receiver or of the sender.  In
+      keeping with current practice, we assume that the option describes
+      the capabilities of the decompressor (receiving side) of the peer
+      that sends the Config-Req.
+
+2.1.  Configuration Option Format
+
+   Both the network control protocol for IPv4, IPCP [RFC1332] and the
+   IPv6 NCP, IPV6CP [RFC2472] may be used to negotiate IP Header
+   Compression parameters for their respective protocols.  The format of
+   the configuration option is the same for both IPCP and IPV6CP.
+
+   Description
+
+      This NCP configuration option is used to negotiate parameters for
+      IP Header Compression.  Successful negotiation of parameters
+      enables the use of Protocol Identifiers FULL_HEADER,
+      COMPRESSED_TCP, COMPRESSED_TCP_NODELTA, COMPRESSED_NON_TCP and
+      CONTEXT_STATE as specified in [RFC2507].  The option format is
+      summarized below.  The fields are transmitted from left to right.
+
+       0                   1                   2                   3
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |     Type      |    Length     |    IP-Compression-Protocol    |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |           TCP_SPACE           |         NON_TCP_SPACE         |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |         F_MAX_PERIOD          |          F_MAX_TIME           |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |           MAX_HEADER          |          suboptions...
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+   Type
+      2
+
+   Length
+      >= 14
+
+   The length may be increased if the presence of additional
+   parameters is indicated by additional suboptions.
+
+   IP-Compression-Protocol
+      0061 (hex)
+
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 3]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   TCP_SPACE
+      The TCP_SPACE field is two octets and indicates the maximum value
+      of a context identifier in the space of context identifiers
+      allocated for TCP.
+
+         Suggested value: 15
+
+      TCP_SPACE must be at least 0 and at most 255 (the value 0 implies
+      having one context).
+
+   NON_TCP_SPACE
+      The NON_TCP_SPACE field is two octets and indicates the maximum
+      value of a context identifier in the space of context identifiers
+      allocated for non-TCP.  These context identifiers are carried in
+      COMPRESSED_NON_TCP, COMPRESSED_UDP and COMPRESSED_RTP packet
+      headers.
+
+         Suggested value: 15
+
+      NON_TCP_SPACE must be at least 0 and at most 65535 (the value 0
+      implies having one context).
+
+   F_MAX_PERIOD
+      Maximum interval between full headers.  No more than F_MAX_PERIOD
+      COMPRESSED_NON_TCP headers may be sent between FULL_HEADER
+      headers.
+
+         Suggested value: 256
+
+      A value of zero implies infinity, i.e. there is no limit to the
+      number of consecutive COMPRESSED_NON_TCP headers.
+
+   F_MAX_TIME
+      Maximum time interval between full headers.  COMPRESSED_NON_TCP
+      headers may not be sent more than F_MAX_TIME seconds after sending
+      the last FULL_HEADER header.
+
+         Suggested value: 5 seconds
+
+      A value of zero implies infinity.
+
+   MAX_HEADER
+      The largest header size in octets that may be compressed.
+
+         Suggested value: 168 octets
+
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 4]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+      The value of MAX_HEADER should be large enough so that at least
+      the outer network layer header can be compressed.  To increase
+      compression efficiency MAX_HEADER should be set to a value large
+      enough to cover common combinations of network and transport layer
+      headers.
+
+   suboptions
+      The suboptions field consists of zero or more suboptions.  Each
+      suboption consists of a type field, a length field and zero or
+      more parameter octets, as defined by the suboption type.  The
+      value of the length field indicates the length of the suboption in
+      its entirety, including the lengths of the type and length fields.
+
+       0                   1                   2
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |     Type      |    Length     |  Parameters...
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+2.2.  RTP-Compression Suboption
+
+   The RTP-Compression suboption is included in the NCP IP-Compression-
+   Protocol option for IPHC if IP/UDP/RTP compression is to be enabled.
+
+   Inclusion of the RTP-Compression suboption enables use of additional
+   Protocol Identifiers COMPRESSED_RTP and COMPRESSED_UDP along with
+   additional forms of CONTEXT_STATE as specified in [RFC2508].
+
+   Description
+
+      Enable use of Protocol Identifiers COMPRESSED_RTP, COMPRESSED_UDP
+      and CONTEXT_STATE as specified in [RFC2508].
+
+          0                   1
+          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+         |     Type      |    Length     |
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+      Type
+         1
+
+      Length
+         2
+
+
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 5]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+2.3.  Enhanced RTP-Compression Suboption
+
+   To use the enhanced RTP header compression defined in [RFC3545], a
+   new sub-option 2 is added.  Sub-option 2 is negotiated instead of,
+   not in addition to, sub-option 1.
+
+   Description
+
+      Enable use of Protocol Identifiers COMPRESSED_RTP and
+      CONTEXT_STATE as specified in [RFC2508].  In addition, enable use
+      of [RFC3545] compliant compression including the use of Protocol
+      Identifier COMPRESSED_UDP with additional flags and use of the C
+      flag with the FULL_HEADER Protocol Identifier to indicate use of
+      HDRCKSUM with COMPRESSED_RTP and COMPRESSED_UDP packets.
+
+          0                   1
+          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+         |     Type      |    Length     |
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+      Type
+         2
+
+      Length
+         2
+
+2.4.  Negotiating header compression for only TCP or only non-TCP
+   packets
+
+   In RFC 2509 it was not possible to negotiate only TCP header
+   compression or only non-TCP header compression because a value of 0
+   in the TCP_SPACE or the NON_TCP_SPACE fields actually means that 1
+   context is negotiated.
+
+   A new suboption 3 is added to allow specifying that the number of
+   contexts for TCP_SPACE or NON_TCP_SPACE is zero, disabling use of the
+   corresponding compression.
+
+
+
+
+
+
+
+
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 6]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   Description
+
+   Enable header compression for only TCP or only non-TCP packets.
+
+       0                   1                   2
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |     Type      |    Length     |   Parameter   |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+      Type
+         3
+
+      Length
+         3
+
+      Parameter
+
+      The parameter is 1 byte with one of the following values:
+
+      1 = the number of contexts for TCP_SPACE is 0
+      2 = the number of contexts for NON_TCP_SPACE is 0
+
+   This suboption overrides the values that were previously assigned to
+   TCP_SPACE and NON_TCP_SPACE in the IP Header Compression option.
+
+   If suboption 3 is included multiple times with parameter 1 and 2,
+   compression is disabled for all packets.
+
+3.  Multiple Network Control Protocols
+
+   The IPHC protocol is able to compress both IPv6 and IPv4 datagrams.
+   Both IPCP and IPV6CP are able to negotiate option parameter values
+   for IPHC.  These values apply to the compression of packets where the
+   outer header is an IPv4 header and an IPv6 header, respectively.
+
+3.1.  Sharing Context Identifier Space
+
+   For the compression and decompression of IPv4 and IPv6 datagram
+   headers the context identifier space is shared.  While the parameter
+   values are independently negotiated, sharing the context identifier
+   spaces becomes more complex when the parameter values differ.  Since
+   the compressed packets share context identifier space, the
+   compression engine must allocate context identifiers out of a common
+   pool; for compressed packets, the decompressor has to examine the
+   context state to determine what parameters to use for decompression.
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 7]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   Context identifier spaces are not shared between TCP and non-
+   TCP/UDP/RTP.  Doing so would require additional mechanisms to ensure
+   that no error can occur when switching from using a context
+   identifier for TCP to non-TCP.
+
+4.  Demultiplexing of Datagrams
+
+   The IPHC specification [RFC2507] defines four header formats for
+   different types of compressed headers.  They are compressed TCP,
+   compressed TCP with no delta encoding, compressed non-TCP with 8 bit
+   CID and compressed non-TCP with 16 bit CID.  The two non-TCP formats
+   may be distinguished by their contents so both may use the same
+   link-level identifier.  A fifth header format, the full header is
+   distinct from a regular header in that it carries additional
+   information to establish shared context between the compressor and
+   decompressor.
+
+   The specification of IP/UDP/RTP Header Compression [RFC2508] defines
+   four additional formats of compressed headers.  They are for
+   compressed UDP and compressed RTP (on top of UDP), both with either
+   8- or 16-bit CIDs.  In addition, there is an explicit error message
+   from the decompressor to the compressor.
+
+   The link layer must be able to indicate these header formats with
+   distinct values.  Nine PPP Data Link Layer Protocol Field values are
+   specified below.
+
+   FULL_HEADER
+      The frame contains a full header as specified in [RFC2508] Section
+      3.3.1.  This is the same as the FULL_HEADER specified in [RFC2507]
+      Section 5.3.
+         Value: 0061 (hex)
+
+   COMPRESSED_TCP
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2507] Section 6a.
+         Value: 0063 (hex)
+
+   COMPRESSED_TCP_NODELTA
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2507] Section 6b.
+         Value: 2063 (hex)
+
+   COMPRESSED_NON_TCP
+      The frame contains a datagram with a compressed header with the
+      format as specified in either Section 6c or Section 6d of
+      [RFC2507].
+         Value: 0065 (hex)
+
+
+
+Koren, et al.               Standards Track                     [Page 8]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   COMPRESSED_RTP_8
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2508] Section 3.3.2, using 8-bit CIDs.
+         Value: 0069 (hex)
+
+   COMPRESSED_RTP_16
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2508] Section 3.3.2, using 16-bit CIDs.
+         Value: 2069 (hex)
+
+   COMPRESSED_UDP_8
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2508] Section 3.3.3 or as specified in
+      [RFC3545] Section 2.1, using 8-bit CIDs.
+         Value: 0067 (hex)
+
+   COMPRESSED_UDP_16
+      The frame contains a datagram with a compressed header with the
+      format as specified in [RFC2508] Section 3.3.3 or as specified in
+      [RFC3545] Section 2.1, using 16-bit CIDs.
+         Value: 2067 (hex)
+
+   CONTEXT_STATE
+      The frame is a link-level message sent from the decompressor to
+      the compressor as specified in [RFC2508] Section 3.3.5.
+         Value: 2065 (hex)
+
+5.  Changes from RFC 2509
+
+   Two new suboptions are specified.  See Sections 2.3 and 2.4.
+
+6.  References
+
+6.1.  Normative References
+
+   [RFC1144]  Jacobson, V., "Compressing TCP/IP Headers for low-speed
+              serial links", RFC 1144, February 1990.
+
+   [RFC1332]  McGregor, G., "The PPP Internet Protocol Control Protocol
+              (IPCP)", RFC 1332, May 1992.
+
+   [RFC2472]  Haskin, D. and E. Allen, "IP Version 6 over PPP", RFC
+              2472, December 1998.
+
+   [RFC2507]  Degermark, M., Nordgren, B. and S. Pink, "Header
+              Compression for IP", RFC 2507, February 1999.
+
+
+
+
+
+Koren, et al.               Standards Track                     [Page 9]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   [RFC2508]  Casner, S. and V. Jacobson, "Compressing IP/UDP/RTP
+              Headers for Low-Speed Serial Links", RFC 2508, February
+              1999.
+
+   [RFC3241]  Bormann, C., "Robust Header Compression (ROHC) over PPP",
+              RFC 3241, April 2002.
+
+   [RFC3545]  Koren, T., Casner, S., Geevarghese, J., Thompson, B. and
+              P. Ruddy, "Enhanced Compressed RTP (CRTP) for Links with
+              High Delay, Packet Loss and Reordering", RFC 3545, July
+              2003.
+
+6.2.  Informative References
+
+   [RFC1661]  Simpson, W., Ed., "The Point-To-Point Protocol (PPP)", STD
+              51, RFC 1661, July 1994.
+
+   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
+              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
+              October 1998.
+
+   [RFC2686]  Bormann, C., "The Multi-Class Extension to Multi-Link
+              PPP", RFC 2686, September 1999.
+
+   [RFC3550]  Schulzrinne, H., Casner, S., Frederick, R. and V.
+              Jacobson, "RTP: A Transport Protocol for Real-Time
+              Applications", RFC 3550, July 2003.
+
+7.  IANA Considerations
+
+   This document does not require any additional allocations from
+   existing namespaces in the IANA Point-to-Point Protocol Field
+   Assignments registry.  However, there are three namespaces that were
+   defined by RFC 1332, RFC 2472, and RFC 2509 but not created in the
+   registry.  Those three namespaces, described below, have been added
+   to the PPP registry.  This document specifies two additional
+   allocations in the third one.
+
+   Section 3.2 of RFC 1332 specifies an IP-Compression-Protocol
+   Configuration Option for the PPP IP Control Protocol and defines one
+   value for the IP-Compression-Protocol type field in that option.  An
+   IANA registry has been created to allocate additional values for that
+   type field.  As stated in RFC 1332, the values for the IP-
+   Compression-Protocol type field are always the same as the (primary)
+   PPP DLL Protocol Number assigned to packets of the particular
+   compression protocol.  Assignment of additional IP-Compression-
+   Protocol type values is through the IETF consensus procedure as
+   specified in [RFC2434].
+
+
+
+Koren, et al.               Standards Track                    [Page 10]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   Section 4.2 of RFC 2472 specifies an IPv6-Compression-Protocol
+   Configuration Option for the PPP IPv6 Control Protocol and defines
+   one value for the IPv6-Compression-Protocol type field in that
+   option.  An IANA registry has been created to allocate additional
+   values for that type field.  The IPv6-Compression-Protocol
+   Configuration Option has the same structure as the IP-Compression-
+   Protocol Configuration Option defined in RFC 1332, but the set of
+   values defined for the type field may be different.  As stated in RFC
+   2472, the values for the IPv6-Compression-Protocol type field are
+   always the same as the (primary) PPP DLL Protocol Number assigned to
+   packets of the particular compression protocol.  Assignment of
+   additional IPv6-Compression-Protocol type values is through the IETF
+   consensus procedure as specified in [RFC2434].
+
+   Section 2.1 of RFC 2509 specifies an additional type value to be
+   registered for both the IP-Compression-Protocol Configuration Option
+   and the IPv6-Compression-Protocol Configuration Option to indicate
+   use of the "IP Header Compression" protocol.  The specification of
+   that type value is repeated in Section 2.1 of this document which
+   obsoletes RFC 2509.  In conjunction with the additional type value,
+   the format for the variable-length option is specified.  The format
+   includes a suboption field that may contain one or more suboptions.
+   Each suboption begins with a suboption type value.  An IANA registry
+   has been created for the suboption type values; and is titled, "IP
+   Header Compression Configuration Option Suboption Types".
+
+   Section 2.2 of RFC 2509 (and this document) defines one suboption
+   type.  Sections 2.3 and 2.4 of this document define two additional
+   suboption types.  It is expected that the number of additional
+   suboptions that will need to be defined is small.  Therefore, anyone
+   wishing to define new suboptions is required to produce a revision of
+   this document to be vetted through the normal Internet Standards
+   process, as specified in [RFC2434].
+
+   RFC 2509 also defines nine PPP Data Link Layer Protocol Field values
+   which are already listed in the IANA registry of Point-to-Point
+   Protocol Field Assignments.  Section 4 of this document repeats the
+   specification of those values without change.
+
+8.  Security Considerations
+
+   Negotiation of the option defined here imposes no additional security
+   considerations beyond those that otherwise apply to PPP [RFC1661].
+
+   The use of header compression can, in rare cases, cause the
+   misdelivery of packets.  If necessary, confidentiality of packet
+   contents should be assured by encryption.
+
+
+
+
+Koren, et al.               Standards Track                    [Page 11]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+   Encryption applied at the IP layer (e.g., using IPSEC mechanisms)
+   precludes header compression of the encrypted headers, though
+   compression of the outer IP header and authentication/security
+   headers is still possible as described in [RFC2507].  For RTP
+   packets, full header compression is possible if the RTP payload is
+   encrypted by itself without encrypting the UDP or RTP headers, as
+   described in [RFC3550].  This method is appropriate when the UDP and
+   RTP header information need not be kept confidential.
+
+9.  Intellectual Property Rights Notice
+
+   The IETF takes no position regarding the validity or scope of any
+   intellectual property 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; neither does it represent that it
+   has made any effort to identify any such rights.  Information on the
+   IETF's procedures with respect to rights in standards-track and
+   standards-related documentation can be found in BCP-11.  Copies of
+   claims of rights made available for publication 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 implementors or users of this specification can
+   be obtained from the IETF Secretariat.
+
+   The IETF invites any interested party to bring to its attention any
+   copyrights, patents or patent applications, or other proprietary
+   rights which may cover technology that may be required to practice
+   this standard.  Please address the information to the IETF Executive
+   Director.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Koren, et al.               Standards Track                    [Page 12]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+10.  Acknowledgements
+
+   Mathias Engan was the primary author of RFC 2509, of which this
+   document is a revision.
+
+11.  Authors' Addresses
+
+   Tmima Koren
+   Cisco Systems, Inc.
+   170 West Tasman Drive
+   San Jose, CA 95134-1706
+   United States
+
+   EMail: tmima@cisco.com
+
+
+   Stephen L. Casner
+   Packet Design
+   3400 Hillview Avenue, Building 3
+   Palo Alto, CA 94304
+   United States
+
+   EMail: casner@packetdesign.com
+
+
+   Carsten Bormann
+   Universitaet Bremen FB3 TZI
+   Postfach 330440
+   D-28334 Bremen, GERMANY
+
+   Phone: +49.421.218-7024
+   Fax: +49.421.218-7000
+   EMail: cabo@tzi.org
+
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+Koren, et al.               Standards Track                    [Page 13]
+
+RFC 3544             IP Header Compression over PPP            July 2003
+
+
+12.  Full Copyright Statement
+
+   Copyright (C) The Internet Society (2003).  All Rights Reserved.
+
+   This document and translations of it may be copied and furnished to
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+   or assist in its implementation may be prepared, copied, published
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+   kind, provided that the above copyright notice and this paragraph are
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+   The limited permissions granted above are perpetual and will not be
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+   This document and the information contained herein is provided on an
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+
+Acknowledgement
+
+   Funding for the RFC Editor function is currently provided by the
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+Koren, et al.               Standards Track                    [Page 14]
+