CN110401923A - A kind of method and VSAT terminal of VSAT terminal bridge and routing mode support simultaneously - Google Patents
A kind of method and VSAT terminal of VSAT terminal bridge and routing mode support simultaneously Download PDFInfo
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- CN110401923A CN110401923A CN201910315753.4A CN201910315753A CN110401923A CN 110401923 A CN110401923 A CN 110401923A CN 201910315753 A CN201910315753 A CN 201910315753A CN 110401923 A CN110401923 A CN 110401923A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/04—Interdomain routing, e.g. hierarchical routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Abstract
The present invention realizes while the method and VAST terminal of compatible support two layers of transmission and three-layer transmission, is by running built-in Linux operating system on VSAT terminal device, kernel starts IPv4 forwarding support, multicast forwarding is supported, Tun/Tap is supported；Establish L 3 virtual network interface card Tun, setting routing forwarding rule；Initializing local arp cache table is sky；Open Ethernet interface and two filec descriptors of Tun interface.Interface packet is identified and taken using select function mechanism in uplink, is made whether that the division of labor of forwarding divides in filtration stage, carries out type identification in air protocol encapsulation.It is forwarded in downlink according to mark, does not do other processing.User, which may be implemented, in the solution of the present invention is inconvenient in the case where modifying existing business equipment double layer network topological structure, it is compatible to support two layers of transmission and three-layer transmission, and it is avoided that interface-free resources waste, mitigate the processing pressure of satellite communication equipment hardware platform to greatest extent.
Description
Technical field
The present invention relates to a kind of satellite channel data service access method, be applied to user's message equipment construction earlier than
Satellite communication system build when, user is inconvenient to modify existing business equipment double layer network topological structure, and tend to future by
Step is transitioned into the occasion of Three Tiered Network Architecture.
Background technique
Since satellite communication has the characteristics that broad covered area, ground distance are insensitive, be usually used in ground communication it is unavailable when
Emergency communication occasion.With the extensive use of Internet technology, user's message equipment transmits data mostly with IP data mode.
VSAT (" Very Small Aperture Terminal ") is referred to as " satellite earth station " that one kind is commonly defended
Star communication equipment, in general VSAT use the antenna of smaller size, and antenna diameter is usually 0.3-3M, equipment is simple, it is compact,
It is at low cost.
Two layers of pass-through mode, i.e. bridge mode are commonly used when the point-to-point application of satellite communication equipment, it is advantageous that management letter
It is single, that is, connect i.e. logical.But with the expansion of network size, a large-scale two layer local area network still can be constituted using bridge mode,
Network fine-grained management is realized complicated；And satellite communication equipment needs to exchange two-layer protocol message in the sky, that causes bandwidth has
Imitate utilization rate degradation.Therefore mainstream satellite communication system is frequently with three-layer routing pass-through mode transmission services data.
When building in face of user's message equipment construction earlier than satellite communication system the case where, user is not for some reason
Facilitate modification existing business equipment double layer network topological structure, it is therefore desirable to which one kind can be suitable for two layers of transmission and three layers simultaneously
The VSAT terminal of transmission supports method.
Summary of the invention
The purpose of the present invention is to provide a kind of methods that VSAT terminal bridge and routing mode are supported simultaneously, to solve to use
In newly-built satellite communication system, original business device work is in two layers of network bridge mode and is inconvenient to the occasion modified at family, also fits
For wishing the subsequent occasion for being gradually transitioned into three-layer routing mode.
The methods that two layers of transmission of the present invention is supported include: in terms of downlink from satellite reception data flow, according to eating dishes without rice or wine
Agreement recovers ether network packet, sends data packet from Ethernet interface；Ethernet interface data are monitored from MAC layer in terms of uplink
Packet, filtering do not need the data for being forwarded to satellite, data to be forwarded are encapsulated according to air protocol, is sent to satellite.Two layers turn
To avoid uncontrollable broadcast from penetrating excessive occupied bandwidth when hair, forbidding the broadcast data in addition to ARP to pass through in terms of filtering, build
Vertical and real-time update arp cache, local group packet carry out arp reply to promote response speed.The foundation of arp cache table is used for simultaneously
Differentiate that IP is in local network or strange land network, generates filtering rule, judge whether IP data packet needs to be forwarded, avoid eating dishes without rice or wine
Bandwidth ineffective occupation.Three layers of Multicast Routing forwarding are walked in terms of multicast, two layers no thoroughfare.
The method that three-layer transmission of the present invention is supported includes: in terms of downlink from satellite reception data flow, according to eating dishes without rice or wine
Agreement recovers IP packet, Linux kernel protocol stack is accessed by Tun interface, by routing forwarding mode from Ethernet interface
It sends；Linux kernel protocol stack receives data packet from Ethernet interface in terms of uplink, is forwarded by routing forwarding mode
To Tun interface, application program takes Tun interface data to encapsulate according to air protocol, is sent to satellite.Wherein kernel protocol stack is opened
Tun/Tap is supported, IPv4 forwarding is supported, multicast forwarding is supported.
The present invention realizes while the compatible scheme for supporting two layers of transmission and three-layer transmission is to run on VSAT terminal device
Built-in Linux operating system, kernel starts IP forwarding support, Tun/Tap is supported；L 3 virtual network interface card Tun is established, road is set
By forward rule (including singlecast router and Multicast Routing)；Initializing local arp cache table is sky；Ethernet interface is opened (to build
Found two layers of Raw Socket mode) and two filec descriptors of Tun interface.In uplink using select function mechanism identification and
Interface packet is taken, is made whether that the division of labor of forwarding divides in filtration stage, carries out type identification in air protocol encapsulation.In downlink
When according to mark be forwarded, do not do other processing.Being made up by rational division of work can be mutually insufficient, and is avoided that interface-free resources
Waste mitigates the processing pressure of satellite communication equipment hardware platform to greatest extent.
Specifically, uplink method are as follows:
S101. interface data packet is taken using select function mechanism；
S102. the three layer data packets that will be got from Tun interface encapsulate according to air protocol stack, carry out class when packaged
Type mark, then sends processed three layer data in the sky on interface；
The Layer 2 data packet that will be got from Ethernet interface, encapsulates according to air protocol, carries out type mark when packaged
Know, then sends processed Layer 2 data on interface in the sky.
Down method are as follows:
S201. user data will be recovered according to the decapsulation of air protocol stack from the received data of air interface；
S202. judge that user data identifies；
If three layer datas, Linux kernel protocol stack is written by Tun interface, utilizes the routing of Linux kernel protocol stack
Forward rule forwards user data from too network interface.By configuring the routing forwarding mechanism of Linux kernel protocol stack, wrap
Singlecast router forwarding and Multicast Routing forwarding are included, using linux kernel to forward user's message from Ethernet interface；
If Layer 2 data, directly user's message is sent from Ethernet interface.
Heretofore described IP, which is forwarded, to be supported, including IP unicast and IP multicast, and IP unicast default is opened, IP multicast according to
The application scenarios of user are opened, such as user needs to open IP multicast when multipart video-meeting, can save massive band width.
Preferably, in S102, after getting Layer 2 data packet from Ethernet interface, filtering does not need the data of forwarding, permits
Perhaps the data passed through are encapsulated according to air protocol stack.
Preferably, in S102, allow ARP to broadcast in Layer 2 data packet filtering and pass through, no thoroughfare for remaining packet；
Preferably, arp cache table is established according to interactive ARP request and response record of eating dishes without rice or wine in Layer 2 data packet filtering
(being established when downlink data processing), and rule is established according to this cache table, whether decision allows IP data packet to pass through (white list
Record form is opened).
Preferably, it in S102, in Layer 2 data packet filtering, if encountering ARP request, and is looked in local arp cache table
To matched record, group packet carries out arp reply, to promote response speed；
Preferably, in S102, in Layer 2 data packet filtering, allow to pass through specified data according to user-defined rule
Packet.
Preferably, in S102, linux kernel routing forwarding rule, including singlecast router and Multicast Routing pass-through mode.
Preferably, in S202, while judging whether it is arp reply, if then updating arp cache table.
Another object of the present invention is to provide a kind of VAST terminal for realizing the above method, comprising:
Digital units are equipped with linux system, are used for L2 layers and the above protocol processes, terminal control and management etc.；
Modem module；
Radio frequency unit is equipped with ether interface and radio frequency interface；
It is supported in linux system starting IP forwarding and Tun/Tap is supported, configure the routing forwarding of Linux kernel protocol stack
Rule opens Ethernet interface and two filec descriptors of Tun interface；
Interface data packet is taken using select function mechanism；After Tun interface gets three layer data packets, according to air protocol
Stack encapsulation, and type identification is carried out, processed three layer data is then sent on interface in the sky；Ethernet interface gets two
It after layer data packet, is encapsulated according to air protocol, and carries out type identification, then send processed two number of plies on interface in the sky
According to；
When receiving data from air interface, user data is recovered according to the decapsulation of air protocol stack；According to number of users
According to mark, if three layer datas, then Linux kernel protocol stack is written by Tun interface in user data, then utilizes Linux
The routing forwarding rule of kernel protocol stack, is forwarded by Ethernet interface；If Layer 2 data, then directly by user's message from
Ethernet interface is sent.
The method and VAST terminal that bridge and routing mode of the present invention are supported simultaneously realize bridge and routing by single device
Mode supports that effectively save user's lower deployment cost can save satellite by internal rational division of work strategy to greatest extent simultaneously
Resource occupation.When can solve user's message equipment construction earlier than the case where satellite communication system construction, use for some reason
Family is inconvenient to the problem of modifying existing business equipment double layer network topological structure, and wishes that follow-up business equipment is gradually transitioned into
The problem of three-layer network topology.
Detailed description of the invention
Fig. 1 is connection schematic diagram of a scenario of the invention
Fig. 2 is the principle of the present invention flow chart
Specific embodiment
Illustrate technical solution of the present invention below in conjunction with a specific embodiment.
Embodiment one: referring to Fig. 1 and Fig. 2, built-in Linux operating system, kernel are run in 100 equipment of VSAT terminal
Start IPv4 forwarding support, multicast forwarding is supported, Tun/Tap is supported；L 3 virtual network interface card Tun is established, setting routing forwarding is advised
Then (including singlecast router and Multicast Routing)；Initializing local arp cache table is sky；It opens Ethernet interface and (establishes two layers of Raw
Socket mode) and two filec descriptors of Tun interface.
Uplink method:
S101. interface data packet is taken using select function mechanism；
S102. the three layer data packets that will be got from Tun interface 102 are encapsulated according to air protocol stack, are carried out when packaged
Then type identification sends processed three layer data in the sky on interface 101；
The Layer 2 data packet that will be got from Ethernet interface 103, encapsulates according to air protocol, carries out type when packaged
Mark, then sends processed Layer 2 data on interface 101 in the sky.
Since data are sent to the data handling procedure of satellite from air interface 101 and air interface 101 connects from satellite
The treatment process for receiving data, is not improvement of the invention, therefore be not described in detail in the present invention, the skill of this field
Art personnel can understand according to existing well known technological means.
In S102, after getting Layer 2 data packet from Ethernet interface, filtering does not need the data of forwarding, allow by
Data are encapsulated according to air protocol stack.In one embodiment, allow ARP to broadcast in Layer 2 data packet filtering to pass through,
No thoroughfare for remaining packet；Further, it is established in Layer 2 data packet filtering according to interactive ARP request and response record of eating dishes without rice or wine
Arp cache table (is established) when downlink data processing, and establishes rule according to this cache table, and whether decision allows IP data packet logical
Cross (white list records form and opens).
In one embodiment, after Ethernet interface 103 receives data packet, judge whether data packet is ARP；If
Then allow to pass through, and inquires in arp cache table whether there is or not occurrence, it is quick by Ethernet interface 103 if any arp reply packet is then organized
It replys；
If data packet is not ARP packet, judge whether data are IPv4 packets；If then judging Target IP according to arp cache table
It is reachable whether address passes through air interface 101, if so, allowing to pass through, if it is not, not allowing then to pass through.In addition, user can be with
Definition rule allows data to pass through if meeting rule；For allow by data packet according to air protocol stack encapsulate, in sky
Type identification is carried out when mouth protocol encapsulation, and then satellite is sent to by air interface 101, and processing terminate.
Down method:
S201. user data will be recovered according to the decapsulation of air protocol stack from the received data of air interface 101；
S202. judge that user data identifies；
If three layer datas, Linux kernel protocol stack is written by Tun interface 102, utilizes Linux kernel protocol stack
Routing forwarding rule, user data is forwarded from too network interface 104.Due to by configuring Linux kernel protocol stack
Routing forwarding mechanism can be forwarded user's message from Ethernet interface 104 using linux kernel；
If Layer 2 data, directly user's message is sent from Ethernet interface 103；Judge whether it is ARP simultaneously
Response, if then updating arp cache table.
The above method realizes that bridge and routing mode are supported simultaneously by single device, and effectively save user's lower deployment cost is led to
Satellite resource occupancy can be saved to greatest extent by crossing internal rational division of work strategy.Can solve user's message equipment construction earlier than
When the case where satellite communication system is built, user is inconvenient to modify existing business equipment double layer network topology knot for some reason
Structure, and it is desirable that follow-up business equipment is gradually transitioned into the problem of three-layer network topology.
Embodiment two: referring to fig. 2, VSAT terminal 100, comprising:
Digital units are equipped with linux system, are used for L2 layers and the above protocol processes, terminal control and management etc.；
Modem module；
Radio frequency unit is equipped with ether interface 103 and radio frequency interface；
It is supported in linux system starting IP forwarding and Tun/Tap is supported, configure the routing forwarding of Linux kernel protocol stack
Rule opens Ethernet interface and two filec descriptors of Tun interface；
Interface data packet is taken using select function mechanism；After Tun interface 102 gets three layer data packets, according to eating dishes without rice or wine
Protocol stack encapsulation, and type identification is carried out, processed three layer data is then sent on interface 101 in the sky；Ethernet interface
It after 103 get Layer 2 data packet, is encapsulated according to air protocol, and carries out type identification, then sent on interface 101 in the sky
Processed Layer 2 data；
When receiving data from air interface 101, user data is recovered according to the decapsulation of air protocol stack；According to user
User data is then written Linux kernel protocol stack by Tun interface 102, then utilized by Data Identification if three layer datas
The routing forwarding rule of Linux kernel protocol stack, is forwarded by Ethernet interface 103；If Layer 2 data, then will directly use
Family message is sent from Ethernet interface 103.
Since data are sent to the data handling procedure of satellite from air interface 101 and air interface 101 connects from satellite
The treatment process for receiving data, is not improvement of the invention, therefore be not described in detail in the present invention, the skill of this field
Art personnel can understand according to existing well known technological means.
When air interface 101 receives data flow by satellite communication module, recovered according to the decapsulation of air protocol stack
User data；Judge whether it is arp reply simultaneously, if then updating arp cache table.
Further, after getting Layer 2 data packet from Ethernet interface 103, filtering does not need the data of forwarding, allows
ARP broadcast passes through, and no thoroughfare for remainder data packet.
And arp cache table is established according to interactive ARP request and response record of eating dishes without rice or wine in Layer 2 data packet filtering,
And rule is established according to this cache table, whether decision allows IP data packet to pass through.
And in Layer 2 data packet filtering, if encountering ARP request, and matched note is found in local arp cache table
Record, group packet carry out arp reply.
VSAT terminal of the invention, by realizing that bridge and routing mode are supported simultaneously in single device, effectively save user
Lower deployment cost can save satellite resource by internal rational division of work strategy to greatest extent and occupy.It can solve user's message
When the case where equipment construction is built earlier than satellite communication system, user is inconvenient to modify existing business equipment two for some reason
Layer network topological structure, and it is desirable that follow-up business equipment is gradually transitioned into the problem of three-layer network topology.
According to the announcement and introduction of description above, those skilled in the art in the invention can also be to above embodiment
It changes and modifies.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to of the invention one
A little modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (10)
1. a kind of method that VSAT terminal bridge and routing mode are supported simultaneously, it is characterised in that:
Start IP forwarding support, Tun/Tap support on VSAT terminal device, configures the routing forwarding of Linux kernel protocol stack
Rule opens Ethernet interface and two filec descriptors of Tun interface；
Uplink method:
S101. interface data packet is taken using select function mechanism；
S102. the three layer data packets that will be got from Tun interface are encapsulated according to air protocol stack, carry out type mark when packaged
Know, then sends processed three layer data on interface in the sky；
The Layer 2 data packet that will be got from Ethernet interface, encapsulates according to air protocol, carries out type identification when packaged, so
Send processed Layer 2 data on interface in the sky afterwards；
Down method:
S201. user data will be recovered according to the decapsulation of air protocol stack from the received data of air interface；
S202. judge that user data identifies；
If three layer datas, Linux kernel protocol stack is written by Tun interface, utilizes the routing forwarding of Linux kernel protocol stack
Rule forwards user data from too network interface；
If Layer 2 data, directly user data is sent from Ethernet interface.
2. the method that VSAT terminal bridge according to claim 1 and routing mode are supported simultaneously, it is characterised in that:
After Layer 2 data packet is got from Ethernet interface, filtering does not need the data of forwarding, allow by data according to sky
Mouth protocol stack encapsulation.
3. the method that VSAT terminal bridge according to claim 2 and routing mode are supported simultaneously, it is characterised in that:
Allow ARP to broadcast in Layer 2 data packet filtering to pass through, no thoroughfare for remainder data packet.
4. the method that VSAT terminal bridge according to claim 2 and routing mode are supported simultaneously, it is characterised in that:
Arp cache table is established according to interactive ARP request and response record of eating dishes without rice or wine in Layer 2 data packet filtering, and slow according to this
It deposits table and establishes rule, whether decision allows IP data packet to pass through.
5. the method that VSAT terminal bridge according to claim 2 and routing mode are supported simultaneously, it is characterised in that:
In Layer 2 data packet filtering, if encountering ARP request, and matched record is found in local arp cache table, group wrap into
Row arp reply.
6. the method that VSAT terminal bridge according to claim 2 and routing mode are supported simultaneously, it is characterised in that: S102
In, in Layer 2 data packet filtering, allowed according to user-defined rule through specified data packet.
7. the method that VSAT terminal bridge according to claim 1 and routing mode are supported simultaneously, it is characterised in that:
Linux kernel routing forwarding rule, including singlecast router and Multicast Routing pass-through mode.
8. the method that VSAT terminal bridge according to claim 1 and routing mode are supported simultaneously, it is characterised in that: S202
In, while judging whether it is arp reply, if then updating arp cache table.
9.VSAT terminal includes:
Digital units are equipped with linux system, are used for L2 layers and the above protocol processes, terminal control and management etc.；
Modem module；
Radio frequency unit is equipped with ether interface and radio frequency interface；
It is supported in linux system starting IP forwarding and Tun/Tap is supported, configure the routing forwarding rule of Linux kernel protocol stack,
Open Ethernet interface and two filec descriptors of Tun interface；
Interface data packet is taken using select function mechanism；After Tun interface gets three layer data packets, sealed according to air protocol stack
Dress, and type identification is carried out, processed three layer data is then sent on interface in the sky；Ethernet interface gets two numbers of plies
It after packet, is encapsulated according to air protocol, and carries out type identification, then send processed Layer 2 data on interface in the sky；
When receiving data from air interface, user data is recovered according to the decapsulation of air protocol stack；According to user data mark
Know, if three layer datas, then Linux kernel protocol stack is written by Tun interface in user data, then utilizes linux kernel
The routing forwarding rule of protocol stack, is forwarded by Ethernet interface；If Layer 2 data, then directly by user's message from ether
Network interface is sent.
10. VSAT terminal according to claim 9, it is characterised in that: after getting Layer 2 data packet from Ethernet interface,
Filtering does not need the data of forwarding, allows ARP to broadcast and passes through, no thoroughfare for remainder data packet；
And arp cache table, and root are established according to interactive ARP request and response record of eating dishes without rice or wine in Layer 2 data packet filtering
Cache table establishes rule accordingly, and whether decision allows IP data packet to pass through；
And in Layer 2 data packet filtering, if encountering ARP request, and matched record is found in local arp cache table,
Group packet carries out arp reply；
After air interface receives data, user data is recovered according to the decapsulation of air protocol stack, judges that user data identifies
When, judge whether to be arp reply, if then updating arp cache table.
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| CN115696447A (en) * | 2022-12-30 | 2023-02-03 | 成都戎星科技有限公司 | Method for realizing active transmission of non-public protocol VSAT network terminal |
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| CN114448750A (en) * | 2022-01-19 | 2022-05-06 | 深圳市联洲国际技术有限公司 | Communication method, device, equipment and medium in pure bridge mode |
| CN115696447A (en) * | 2022-12-30 | 2023-02-03 | 成都戎星科技有限公司 | Method for realizing active transmission of non-public protocol VSAT network terminal |
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