Transmission of IPv6 Packets over IEEE 802.11 Networks operating in mode Outside the Context of a Basic Service Set (IPv6-over-80211-OCB)
draft-ietf-ipwave-ipv6-over-80211ocb-18
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 8691.
|
|
|---|---|---|---|
| Authors | Alexandre Petrescu , Nabil Benamar , Jerome Haerri , Jong-Hyouk Lee , Thierry Ernst | ||
| Last updated | 2018-02-19 | ||
| Replaces | draft-petrescu-ipv6-over-80211p | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Formats | |||
| Reviews |
GENART Telechat review
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by Roni Even
Ready w/issues
TSVART Last Call review
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by Joerg Ott
On the Right Track
GENART Last Call review
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by Roni Even
Almost ready
|
||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | WG Consensus: Waiting for Write-Up | |
| Document shepherd | Carlos J. Bernardos | ||
| IESG | IESG state | Became RFC 8691 (Proposed Standard) | |
| Consensus boilerplate | Yes | ||
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | Carlos Bernardos <cjbc@it.uc3m.es> |
draft-ietf-ipwave-ipv6-over-80211ocb-18
| DSAP |I| SSAP |C| Control field | Org. code...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
... Organizational Code | Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
IPv6 Base Header
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Version| Traffic Class | Flow Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Payload Length | Next Header | Hop Limit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ Source Address +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ Destination Address +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Router Advertisement
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cur Hop Limit |M|O| Reserved | Router Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reachable Time |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Retrans Timer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options ...
+-+-+-+-+-+-+-+-+-+-+-+-
The value of the Data Rate field in the Radiotap header is set to 6
Mb/s. This indicates the rate at which this RA was received.
The value of the Transmitter address in the IEEE 802.11 Data Header
is set to a 48bit value. The value of the destination address is
33:33:00:00:00:1 (all-nodes multicast address). The value of the BSS
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Id field is ff:ff:ff:ff:ff:ff, which is recognized by the network
protocol analyzer as being "broadcast". The Fragment number and
sequence number fields are together set to 0x90C6.
The value of the Organization Code field in the Logical-Link Control
Header is set to 0x0, recognized as "Encapsulated Ethernet". The
value of the Type field is 0x86DD (hexadecimal 86DD, or otherwise
#86DD), recognized as "IPv6".
A Router Advertisement is periodically sent by the router to
multicast group address ff02::1. It is an icmp packet type 134. The
IPv6 Neighbor Discovery's Router Advertisement message contains an
8-bit field reserved for single-bit flags, as described in [RFC4861].
The IPv6 header contains the link local address of the router
(source) configured via EUI-64 algorithm, and destination address set
to ff02::1. Recent versions of network protocol analyzers (e.g.
Wireshark) provide additional informations for an IP address, if a
geolocalization database is present. In this example, the
geolocalization database is absent, and the "GeoIP" information is
set to unknown for both source and destination addresses (although
the IPv6 source and destination addresses are set to useful values).
This "GeoIP" can be a useful information to look up the city,
country, AS number, and other information for an IP address.
The Ethernet Type field in the logical-link control header is set to
0x86dd which indicates that the frame transports an IPv6 packet. In
the IEEE 802.11 data, the destination address is 33:33:00:00:00:01
which is the corresponding multicast MAC address. The BSS id is a
broadcast address of ff:ff:ff:ff:ff:ff. Due to the short link
duration between vehicles and the roadside infrastructure, there is
no need in IEEE 802.11-OCB to wait for the completion of association
and authentication procedures before exchanging data. IEEE
802.11-OCB enabled nodes use the wildcard BSSID (a value of all 1s)
and may start communicating as soon as they arrive on the
communication channel.
H.2. Capture in Normal Mode
The same IPv6 Router Advertisement packet described above (monitor
mode) is captured on the Host, in the Normal mode, and depicted
below.
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Ethernet II Header
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
...Destination | Source...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
...Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
IPv6 Base Header
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Version| Traffic Class | Flow Label |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Payload Length | Next Header | Hop Limit |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ Source Address +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ Destination Address +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Router Advertisement
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cur Hop Limit |M|O| Reserved | Router Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reachable Time |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Retrans Timer |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options ...
+-+-+-+-+-+-+-+-+-+-+-+-
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One notices that the Radiotap Header, the IEEE 802.11 Data Header and
the Logical-Link Control Headers are not present. On the other hand,
a new header named Ethernet II Header is present.
The Destination and Source addresses in the Ethernet II header
contain the same values as the fields Receiver Address and
Transmitter Address present in the IEEE 802.11 Data Header in the
"monitor" mode capture.
The value of the Type field in the Ethernet II header is 0x86DD
(recognized as "IPv6"); this value is the same value as the value of
the field Type in the Logical-Link Control Header in the "monitor"
mode capture.
The knowledgeable experimenter will no doubt notice the similarity of
this Ethernet II Header with a capture in normal mode on a pure
Ethernet cable interface.
An Adaptation layer is inserted on top of a pure IEEE 802.11 MAC
layer, in order to adapt packets, before delivering the payload data
to the applications. It adapts 802.11 LLC/MAC headers to Ethernet II
headers. In further detail, this adaptation consists in the
elimination of the Radiotap, 802.11 and LLC headers, and in the
insertion of the Ethernet II header. In this way, IPv6 runs straight
over LLC over the 802.11-OCB MAC layer; this is further confirmed by
the use of the unique Type 0x86DD.
Appendix I. Extra Terminology
The following terms are defined outside the IETF. They are used to
define the main terms in the main terminology section Section 2.
DSRC (Dedicated Short Range Communication): a term defined outside
the IETF. The US Federal Communications Commission (FCC) Dedicated
Short Range Communication (DSRC) is defined in the Code of Federal
Regulations (CFR) 47, Parts 90 and 95. This Code is referred in the
definitions below. At the time of the writing of this Internet
Draft, the last update of this Code was dated October 1st, 2010.
DSRCS (Dedicated Short-Range Communications Services): a term defined
outside the IETF. The use of radio techniques to transfer data over
short distances between roadside and mobile units, between mobile
units, and between portable and mobile units to perform operations
related to the improvement of traffic flow, traffic safety, and other
intelligent transportation service applications in a variety of
environments. DSRCS systems may also transmit status and
instructional messages related to the units involve. [Ref. 47 CFR
90.7 - Definitions]
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OBU (On-Board Unit): a term defined outside the IETF. An On-Board
Unit is a DSRCS transceiver that is normally mounted in or on a
vehicle, or which in some instances may be a portable unit. An OBU
can be operational while a vehicle or person is either mobile or
stationary. The OBUs receive and contend for time to transmit on one
or more radio frequency (RF) channels. Except where specifically
excluded, OBU operation is permitted wherever vehicle operation or
human passage is permitted. The OBUs mounted in vehicles are
licensed by rule under part 95 of the respective chapter and
communicate with Roadside Units (RSUs) and other OBUs. Portable OBUs
are also licensed by rule under part 95 of the respective chapter.
OBU operations in the Unlicensed National Information Infrastructure
(UNII) Bands follow the rules in those bands. - [CFR 90.7 -
Definitions].
RSU (Road-Side Unit): a term defined outside of IETF. A Roadside
Unit is a DSRC transceiver that is mounted along a road or pedestrian
passageway. An RSU may also be mounted on a vehicle or is hand
carried, but it may only operate when the vehicle or hand- carried
unit is stationary. Furthermore, an RSU operating under the
respectgive part is restricted to the location where it is licensed
to operate. However, portable or hand-held RSUs are permitted to
operate where they do not interfere with a site-licensed operation.
A RSU broadcasts data to OBUs or exchanges data with OBUs in its
communications zone. An RSU also provides channel assignments and
operating instructions to OBUs in its communications zone, when
required. - [CFR 90.7 - Definitions].
Authors' Addresses
Alexandre Petrescu
CEA, LIST
CEA Saclay
Gif-sur-Yvette , Ile-de-France 91190
France
Phone: +33169089223
Email: Alexandre.Petrescu@cea.fr
Nabil Benamar
Moulay Ismail University
Morocco
Phone: +212670832236
Email: n.benamar@est.umi.ac.ma
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Jerome Haerri
Eurecom
Sophia-Antipolis 06904
France
Phone: +33493008134
Email: Jerome.Haerri@eurecom.fr
Jong-Hyouk Lee
Sangmyung University
31, Sangmyeongdae-gil, Dongnam-gu
Cheonan 31066
Republic of Korea
Email: jonghyouk@smu.ac.kr
Thierry Ernst
YoGoKo
France
Email: thierry.ernst@yogoko.fr
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