IP Parcels
draft-templin-intarea-parcels-07
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| Document | Type | Active Internet-Draft (individual) | |
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| Author | Fred Templin | ||
| Last updated | 2022-02-02 | ||
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draft-templin-intarea-parcels-07
Network Working Group F. L. Templin, Ed.
Internet-Draft Boeing Research & Technology
Updates: RFC2675 (if approved) 2 February 2022
Intended status: Standards Track
Expires: 6 August 2022
IP Parcels
draft-templin-intarea-parcels-07
Abstract
IP packets (both IPv4 and IPv6) are understood to contain a unit of
data which becomes the retransmission unit in case of loss. Upper
layer protocols such as the Transmission Control Protocol (TCP)
prepare data units known as "segments", with traditional arrangements
including a single segment per packet. This document presents a new
construct known as the "IP Parcel" which permits a single packet to
carry multiple segments, essentially creating a "packet-of-packets".
Parcels can be broken into smaller parcels by a middlebox on the path
if necessary, then rejoined into one or more repackaged parcels to be
forwarded further toward the final destination. While not desirable,
reordering of segments within parcels and individual segment loss are
possible. But, what matters is that the number of parcels delivered
to the final destination should be kept to a minimum, and that loss
or receipt of individual segments (and not parcel size) determines
the retransmission unit.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 6 August 2022.
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Copyright Notice
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
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provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Background and Motivation . . . . . . . . . . . . . . . . . . 4
4. IP Parcel Formation . . . . . . . . . . . . . . . . . . . . . 5
5. Transmission of IP Parcels . . . . . . . . . . . . . . . . . 7
6. Parcel Path Qualification . . . . . . . . . . . . . . . . . . 9
7. Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8. RFC2675 Updates . . . . . . . . . . . . . . . . . . . . . . . 10
9. IPv4 Jumbograms . . . . . . . . . . . . . . . . . . . . . . . 10
10. Implementation Status . . . . . . . . . . . . . . . . . . . . 10
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
12. Security Considerations . . . . . . . . . . . . . . . . . . . 11
13. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.1. Normative References . . . . . . . . . . . . . . . . . . 11
14.2. Informative References . . . . . . . . . . . . . . . . . 11
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
IP packets (both IPv4 [RFC0791] and IPv6 [RFC8200]) are understood to
contain a unit of data which becomes the retransmission unit in case
of loss. Upper layer protocols such as the Transmission Control
Protocol (TCP) [RFC0793], QUIC [RFC9000], LTP [RFC5326] and others
prepare data units known as "segments", with traditional arrangements
including a single segment per packet. This document presents a new
construct known as the "IP Parcel" which permits a single packet to
carry multiple segments. This essentially creates a "packet-of-
packets" with the IP layer headers appearing only once but with
possibly multiple upper layer protocol segments.
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Parcels are formed when an upper layer protocol entity (identified by
the "5-tuple" source IP address/port number, destination IP address/
port number and protocol number) prepares a buffer of data with the
concatenation of up to 64 properly-formed segments that can be broken
out into smaller parcels using a copy of the IP header. All segments
except the final segment must be equal in size and no larger than
65535 (minus headers), while the final segment must be no larger than
the others but may be smaller. The upper layer protocol entity then
delivers the buffer and non-final segment size to the IP layer, which
appends the necessary IP headers to identify this as a parcel and not
an ordinary packet.
Each original parcel can traverse arbitrarily many parcel-capable IP
links in the path until arriving at a parcel-capable ingress
middlebox at the edge of a larger Internetwork. The ingress
middlebox may break the parcel out into smaller (sub-)parcels and
encapsulate them in headers suitable for traversing the Internetwork.
These smaller parcels may then be rejoined into one or more larger
parcels at an egress middlebox which forwards them further toward the
final destination. Repackaging of parcels is therefore commonplace,
while reordering of segments within a parcel or even loss of
individual segments is possible but not desirable. But, what matters
is that the number of parcels delivered to the final destination
should be kept to a minimum, and that loss or receipt of individual
segments (and not parcel size) determines the retransmission unit.
The following sections discuss rationale for creating and shipping
parcels as well as the actual protocol constructs and procedures
involved. It is expected that the parcel concept may drive future
innovation in applications, operating systems, network equipment and
data links.
2. Terminology
A "parcel" is defined as "a thing or collection of things wrapped in
paper in order to be carried or sent by mail". Indeed, there are
many examples of parcel delivery services worldwide that provide an
essential transit backbone for efficient business and consumer
transactions.
In this same spirit, an "IP parcel" is simply a collection of up to
64 upper layer protocol segments wrapped in an efficient package for
transmission and delivery (i.e., a "packet of packets") while a
"singleton IP parcel" is simply a parcel that contains a single
segment. IP parcels are distinguished from ordinary packets through
the special header constructions discussed in this document.
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119][RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Background and Motivation
Studies have shown that by sending and receiving larger packets
applications can realize greater performance due to reduced numbers
of system calls and interrupts as well as larger atomic data copies
between kernel and user space. Within edge networks, large packets
also result in reduced numbers of device interrupts and better
network utilization in comparison with smaller packet sizes.
A first study involved performance enhancement of the QUIC protocol
[RFC9000] using the Generic Segment/Receive Offload (GSO/GRO)
facility [QUIC]. GSO/GRO provide a robust (but non-standard) service
very similar in nature to the IP parcel service described here, and
its application has shown significant performance increases due to
the increased transfer unit size between the operating system kernel
and QUIC application. A second study showed that GSO/GRO also
improved performance for the Licklider Transmission Protocol (LTP)
[RFC5326][I-D.templin-dtn-ltpfrag] to a more limited extent.
Historically, the NFS protocol also saw significant performance
increases using larger (single-segment) UDP datagrams even when IP
fragmentation is invoked, and LTP still follows this profile today.
TCP also benefits from larger packet sizes and efforts have
investigated TCP performance using jumbograms internally with changes
to the linux GSO/GRO facilities [BIG-TCP]. The idea is to use the
jumbo payload internally and to allow GSO and GRO to use buffer sizes
larger than just ~64KB, but with the understanding that links that
support jumbos natively are not yet widely available. Hence, IP
parcels provides a packaging that can be considered in the near term
under current deployment limitations.
The issue with sending large packets is that they are often lost at
links with smaller Maximum Transmission Units (MTUs), and the
resulting Packet Too Big (PTB) message may be lost somewhere in the
path back to the original source. This "Path MTU black hole"
condition can degrade performance unless robust path probing
techniques are used, however the best case performance always occurs
when no packets are lost due to size restrictions.
These considerations therefore motivate a design where the maximum
segment size should be no larger than 65535 (minus headers), while
parcels that carry the segments may themselves be significantly
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larger. Then, even if a middlebox needs to sub-divide the parcels
into smaller sub-parcels to forward further toward the final
destination, an important performance optimization for both the
original source and final destination can be realized.
An analogy: when a consumer orders 50 small items from a major online
retailer, the retailer does not ship the order in 50 separate small
boxes. Instead, the retailer puts as many of the small boxes as
possible into one or a few larger boxes (or parcels) then places the
parcels on a semi-truck or airplane. The parcels arrive at a
regional distribution center where they may be further redistributed
into slightly smaller parcels that get delivered to the consumer.
But most often, the consumer will only find one or a few parcels at
his doorstep and not 50 individual boxes. This greatly reduces
handling overhead for both the retailer and consumer.
4. IP Parcel Formation
IP parcel formation is invoked by an upper layer protocol (identified
by the 5-tuple as above) when it emits a data buffer containing the
concatenation of up to 64 segments. All non-final segments MUST be
equal in length while the final segment MUST NOT be larger but MAY be
smaller. Each non-final segment MUST be no larger than 65535 minus
the length of the IP header plus extensions, minus the length of an
additional IPv6 header in case encapsulation is necessary (see:
Section 5). The upper layer protocol then presents the buffer and
non-final segment size to the IP layer which appends a single IP
header (plus any extension headers) before presenting the parcel to
the adaptation layer (see: Section 5).
For IPv4, the IP layer prepares the parcel by appending an IPv4
header with a Jumbo Payload option (identified by option code TBD)
formed as follows:
+--------+--------+--------+--------+--------+--------+
|000(TBD)|00000110| Jumbo Payload Length |
+--------+--------+--------+--------+--------+--------+
where "Jumbo Payload Length" is a 32-bit unsigned integer value (in
network byte order) set to the lengths of the IPv4 header plus all
concatenated segments. The IP layer next sets the IPv4 header DF bit
to 1, then sets the IPv4 header Total Length field to the length of
the IPv4 header plus the length of the first segment only. Note that
the IP layer can form true IPv4 jumbograms (as opposed to parcels) by
instead setting the IPv4 header Total Length field to 0 (see:
Section 9).
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For IPv6, the IP layer forms a parcel by appending an IPv6 header
with a Jumbo Payload option [RFC2675] the same as for IPv4 above
where "Jumbo Payload Length" is set to the lengths of the IPv6 Hop-
by-Hop Options header and any other extension headers present plus
all concatenated segments. The IP layer next sets the IPv6 header
Payload Length field to the lengths of the IPv6 Hop-by-Hop Options
header and any other extension headers present plus the length of the
first segment only. As with IPv4 the IP layer can form true IPv6
jumbograms (as opposed to parcels) by instead setting the IPv6 header
Payload Length field to 0 (see: [RFC2675]).
An IP parcel therefore has the following structure:
+--------+--------+--------+--------+
| |
~ Segment J (K octets) ~
| |
+--------+--------+--------+--------+
~ ~
~ ~
+--------+--------+--------+--------+
| |
~ Segment 3 (L octets) ~
| |
+--------+--------+--------+--------+
| |
~ Segment 2 (L octets) ~
| |
+--------+--------+--------+--------+
| |
~ Segment 1 (L octets) ~
| |
+--------+--------+--------+--------+
| IP Header Plus Extensions |
~ {Total, Payload} Length = M ~
| Jumbo Payload Length = N |
+--------+--------+--------+--------+
where J is the total number of segments (between 1 and 64), L is the
length of each non-final segment which MUST NOT be larger than 65535
(minus headers as above) and K is the length of the final segment
which MUST NOT be larger than L. The values M and N are then set to
the length of the IP header plus extensions for IPv4 or to the length
of the extensions only for IPv6, then further calculated as follows:
M = M + ((J-1) ? L : K)
N = N + (((J-1) * L) + K)
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Note: a "singleton" parcel is one that includes only the IP header
plus extensions with a single segment of length K, while a "null"
parcel is a singleton with K=0, i.e., a parcel consisting of only the
IP header plus extensions with no octets beyond.
5. Transmission of IP Parcels
The IP layer next presents the parcel to the outgoing network
interface. For ordinary IP interfaces, the IP layer simply forwards
the parcel over the underlying link the same as for any IP packet
after which it may then be forwarded by any number of routers over
additional IP links. If any next hop IP link in the path either does
not support parcels or configures an MTU that is too small to transit
the parcel without fragmentation, the router instead opens the parcel
and forwards each enclosed segment as a separate IP packet (i.e., by
appending a copy of the parcel's IP header to each segment but
without including the Jumbo Payload option). Or, if the router does
not recognize parcels at all, it drops the parcel and returns an ICMP
"Parameter Problem" message according to [RFC2675].
If the outgoing network interface is an OMNI interface
[I-D.templin-6man-omni], the OMNI Adaptation Layer (OAL) of this
First Hop Segment (FHS) OAL node forwards the parcel to the next OAL
hop which may be either an OAL intermediate node or the Last Hop
Segment (LHS) OAL node (which may also be the final destination
itself). The OAL assigns a monotonically- incrementing (modulo 127)
"Parcel ID" and subdivides the parcel into sub-parcels no larger than
the maximum of the path MTU to the next hop or 64KB (minus the length
of encapsulation headers) by determining the number of segments of
length L that can fit into each sub-parcel under these size
constraints. For example, if the OAL determines that a sub-parcel
can contain 3 segments of length L, it creates sub-parcels with the
first containing segments 1-3, the second containing segments 4-6,
etc. and with the final containing any remaining segments. The OAL
then appends an identical IP header plus extensions to each sub-
parcel while resetting M and N in each according to the above
equations with J set to 3 and K set to L for each non-final sub-
parcel and with J set to the remaining number of segments for the
final sub-parcel.
The OAL next performs IP encapsulation on each sub-parcel with
destination set to the next hop IP address then inserts an IPv6
Fragment Header after the IP encapsulation header, i.e., even if the
encapsulation header is IPv4, even if no actual fragmentation is
needed and/or even if the Jumbo Payload option is present. The OAL
then assigns a randomly-initialized 32-bit Identification number that
is monotonically-incremented for each consecutive sub-parcel, then
performs IPv6 fragmentation over the sub-parcel if necessary to
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create fragments small enough to traverse the path to the next hop
while writing the Parcel ID and setting or clearing the "Parcel (P)"
and "(More) Sub-Parcels (S)" bits in the Fragment Header of the first
fragment (see: [I-D.templin-6man-fragrep]). (The OAL sets P to 1 for
a parcel or to 0 for a non-parcel. When P is 1, the OAL next sets S
to 1 for non-final sub-parcels or to 0 if the sub-parcel contains the
final segment.) The OAL then forwards each IP encapsulated packet/
fragment to the next OAL hop.
When the next hop OAL node receives the encapsulated IP fragments or
whole packets, it reassembles if necessary. If the P flag in the
first fragment is 0, the next hop then processes the reassembled
entity as an ordinary IP packet; otherwise it continues processing as
a sub-parcel. If the next hop is an OAL intermediate node, it
retains the sub-parcels along with their Parcel ID and Identification
values for a brief time in hopes of re-combining with peer sub-
parcels of the same original parcel identified by the 4-tuple
consisting of the IP encapsulation source and destination,
Identification and Parcel ID. The combining entails the
concatenation of the segments included in sub-parcels with the same
Parcel ID and with Identification values within 64 of one another to
create a larger sub-parcel possibly even as large as the entire
original parcel. Order of concatenation is not important, with the
exception that the final sub-parcel (i.e., the one with S set to 0)
must occur as the final concatenation before transmission. The OAL
then appends a common IP header plus extensions to each re-combined
sub-parcel while resetting M and N in each according to the above
equations with J, K and L set accordingly.
This OAL intermediate node next forwards the re-combined sub-
parcel(s) to the next hop toward the LHS OAL node using encapsulation
the same as specified above. (The intermediate node MUST ensure that
the S flag remains set to 0 in the sub-parcel that contains the final
segment.) When the parcel or sub-parcels arrive at the LHS OAL node,
the OAL re-combines them into the largest possible sub-parcels while
honoring the S flag. If the LHS OAL node is also the final
destination, it delivers the sub-parcels to upper layers which act on
the enclosed 5-tuple information supplied by the original source. If
the LHS OAL node is not the final destination, it instead forwards
each sub-parcel the same as for an ordinary IP packet the same as
discussed above.
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Note: while the LHS OAL node may be tempted to re-combine the sub-
parcels of multiple different parcels with identical upper layer
protocol 5-tuples and with non-final segments of identical length,
this process could become complicated when the different parcels each
have final segments of diverse lengths. Since this could possibly
defeat any perceived performance advantages, the decision of whether
and how to perform inter-parcel concatenation is an implementation
matter.
Note: some IPv6 fragmentation and reassembly implementations may
require a well-formed IPv6 header to perform their operations. When
the encapsulation is based on IPv4, such implementations translate
the encapsulation header into an IPv6 header with IPv4-Mapped IPv6
addresses before performing the fragmentation/reassembly operation,
then restore the original IPv4 header before further processing.
6. Parcel Path Qualification
To determine whether parcels are supported over at least a leading
portion of the forward path toward the destination, the original
source can prepare a "test parcel" with a single segment that
contains an upper layer protocol probe (e.g., a TCP/UDP probe
segment, an ICMP Echo Request message, etc.). If the original source
receives a probe reply, it marks the path as "parcels supported". If
the original source instead receives an ICMP Parameter Problem
message, it marks the path as "parcels not supported".
Parcel path qualification should therefore be performed in parallel
with sending real data as ordinary IP packets until after the path
becomes qualified. The original source can then begin sending real
data in IP parcels.
Parcel path qualification can also be conducted in conjunction with
path MTU probing by including a padded probe message to test for link
restrictions and/or by including a "minimum path MTU" option allowing
routers to write the minimum link MTU observed.
7. Integrity
Parcels can range in length from as small as only the IP header sizes
to as large as the IP headers plus (64 * (2**16 minus headers))
octets. Although link layer integrity checks provide sufficient
protection for contiguous data blocks up to approximately 9KB,
reliance on the presence of link-layer integrity checks may not be
possible over links such as tunnels. Moreover, the segment contents
of a received parcel may arrive in an incomplete and/or rearranged
order with respect to their original packaging.
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For these reasons, the OAL at each hop includes an integrity check
when it performs IP fragmentation on a sub-parcel, with the integrity
verified during reassembly at the next hop. From an end-to-end
perspective, upper layers must include individual integrity checks
with each segment included in the parcel with a strength compatible
with the segment length. The integrity check must then be verified
at the final destination on a per-segment basis, which discards any
corrupted segments and considers them as a loss event.
8. RFC2675 Updates
Section 3 of [RFC2675] provides a list of certain conditions to be
considered as errors. In particular:
error: IPv6 Payload Length != 0 and Jumbo Payload option present
error: Jumbo Payload option present and Jumbo Payload Length <
65,536
Implementations that obey this specification ignore these conditions
and do not consider them as errors.
9. IPv4 Jumbograms
By defining a new IPv4 Jumbo Payload option, this document also
implicitly enables an IPv4 jumbogram service defined as an IPv4
packet with Total Length set to 0 and with a Jumbo Payload option in
the IPv4 extension headers. All aspects of IPv4 jumbograms
(including length determination for upper layer protocols) follow
exactly the same as for IPv6 jumbograms as specified in [RFC2675].
10. Implementation Status
Common widely-deployed implementations include services such as TCP
Segmentation Offload (TSO) and Generic Segmentation/Receive Offload
(GSO/GRO). These services support a robust (but not standardized)
service that has been shown to improve performance in many instances.
Implementation of the IP parcel service is a work in progress.
11. IANA Considerations
The IANA is instructed to allocate a new IP option code in the 'ip
option numbers' registry for the "JUMBO - IPv4 Jumbo Payload" option.
The Copy and Class fields must both be set to 0, and the Number and
Value fields must both be set to 'TBD (to be assigned by IANA)'. The
reference must be set to this document (RFCXXXX).
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12. Security Considerations
Communications networking security is necessary to preserve
confidentiality, integrity and availability.
13. Acknowledgements
This work was inspired by ongoing AERO/OMNI/DTN investigations. The
concepts were further motivated through discussions on the intarea
list.
A considerable body of work over recent years has produced useful
"segmentation offload" facilities available in widely-deployed
implementations.
.
14. References
14.1. Normative References
[RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,
DOI 10.17487/RFC0791, September 1981,
<https://www.rfc-editor.org/info/rfc791>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC2675] Borman, D., Deering, S., and R. Hinden, "IPv6 Jumbograms",
RFC 2675, DOI 10.17487/RFC2675, August 1999,
<https://www.rfc-editor.org/info/rfc2675>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/info/rfc8200>.
14.2. Informative References
[BIG-TCP] Dumazet, E., "BIG TCP, Netdev 0x15 Conference (virtual),
https://netdevconf.info/0x15/session.html?BIG-TCP", 31
August 2021.
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[I-D.ietf-tcpm-rfc793bis]
Eddy, W. M., "Transmission Control Protocol (TCP)
Specification", Work in Progress, Internet-Draft, draft-
ietf-tcpm-rfc793bis-25, 7 September 2021,
<https://www.ietf.org/archive/id/draft-ietf-tcpm-
rfc793bis-25.txt>.
[I-D.templin-6man-fragrep]
Templin, F. L., "IPv6 Fragment Retransmission and Path MTU
Discovery Soft Errors", Work in Progress, Internet-Draft,
draft-templin-6man-fragrep-05, 22 December 2021,
<https://www.ietf.org/archive/id/draft-templin-6man-
fragrep-05.txt>.
[I-D.templin-6man-omni]
Templin, F. L. and T. Whyman, "Transmission of IP Packets
over Overlay Multilink Network (OMNI) Interfaces", Work in
Progress, Internet-Draft, draft-templin-6man-omni-52, 31
December 2021, <https://www.ietf.org/archive/id/draft-
templin-6man-omni-52.txt>.
[I-D.templin-dtn-ltpfrag]
Templin, F. L., "LTP Fragmentation", Work in Progress,
Internet-Draft, draft-templin-dtn-ltpfrag-08, 1 February
2022, <https://www.ietf.org/archive/id/draft-templin-dtn-
ltpfrag-08.txt>.
[QUIC] Ghedini, A., "Accelerating UDP packet transmission for
QUIC, https://blog.cloudflare.com/accelerating-udp-packet-
transmission-for-quic/", 8 January 2020.
[RFC0793] Postel, J., "Transmission Control Protocol", STD 7,
RFC 793, DOI 10.17487/RFC0793, September 1981,
<https://www.rfc-editor.org/info/rfc793>.
[RFC5326] Ramadas, M., Burleigh, S., and S. Farrell, "Licklider
Transmission Protocol - Specification", RFC 5326,
DOI 10.17487/RFC5326, September 2008,
<https://www.rfc-editor.org/info/rfc5326>.
[RFC9000] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
Multiplexed and Secure Transport", RFC 9000,
DOI 10.17487/RFC9000, May 2021,
<https://www.rfc-editor.org/info/rfc9000>.
Author's Address
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Fred L. Templin (editor)
Boeing Research & Technology
P.O. Box 3707
Seattle, WA 98124
United States of America
Email: fltemplin@acm.org
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