CN201114131Y - Device for accomplishing satellite net and ground local area network interconnecting and communicating - Google Patents
Device for accomplishing satellite net and ground local area network interconnecting and communicating Download PDFInfo
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- CN201114131Y CN201114131Y CNU2007200453986U CN200720045398U CN201114131Y CN 201114131 Y CN201114131 Y CN 201114131Y CN U2007200453986 U CNU2007200453986 U CN U2007200453986U CN 200720045398 U CN200720045398 U CN 200720045398U CN 201114131 Y CN201114131 Y CN 201114131Y
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Abstract
The utility model relates to a device realizing interconnection between a satellite network and a ground local area network, which utilizes a GRE tunnel to make the satellite network and the ground local area network to communicate with each other. The device comprises a main station unit (1), satellite receiving and transmitting units (2), a near end router (4) and an auxiliary unit (3), wherein a near end satellite receiving and transmitting unit (2) at one end transmits satellite signals to the remote end satellite receiving and transmitting unit (2) at the other end, the near end router (4) is connected with the near end satellite receiving and transmitting unit (2) through a network, and the near end satellite receiving and transmitting unit (2) is connected with the auxiliary unit (3) through a cable and a distributer. The device has the advantages that the device makes the satellite network and the ground local area network (5) to inosculate together well, thus the satellite network can be flexibly used, allowing the satellite network to be used in the current most popular internet based on IP; the device ensures that the compatibility of the satellite network can be significantly improved, and the technique used in the internet also can be used in the satellite network.
Description
Technical field
The utility model is to utilize gre tunneling to make satellite network and ground LAN mutual communication, belongs to the technical field of the fusion of wireless communication and wired network communication.
Background technology
Because the many regional ground communication bandwidth resources of present stage China are not enough, can't support the Streaming Media transmission fully, and the Internet operators implement restricted online broadcast business in order to prevent network broadcasting windstorm simultaneously; Operator takies in order to prevent that bandwidth from being used by the minority Streaming Media simultaneously, is provided with many policy constraints Video Applications.But some features as long-range classroom instruction are that its network downlink information amount is big, and are based on image and sound mostly.Obviously existing terrestrial interconnection net can not support well that channel then can address the above problem just via satellite.But because the DVB-RCS system, the satellite communication machine has been distributed one section fixed IP addresses providing when giving the client, and these addresses are the addresses of using in satellite network, if merge with client's local area network (LAN), may meet difficulty.Because client's ground network again may with communication equipment not at the same network segment, like this communication equipment in the satellite network just can't with the devices communicating in the ground network, for convenience the client to own local area network (LAN) management, also in order to allow satellite network and local area network (LAN) merge, can adopt tunneling technique to solve, satellite receiving terminal on both sides adds a router simultaneously, between these two routers, set up a virtual tunnel, allow the address assignment at two ends need not to consider the address of communication equipment, oneself distribute own convenient just can of managing.
Summary of the invention
Technical problem: the purpose of this utility model is to overcome deficiency of the prior art, provide a kind of and can realize satellite network and the ground LAN function that interconnects, and keep local area network (LAN) can realize the device that satellite network and ground LAN interconnect.Save improvement cost, realize greater functionality.
Technical scheme: generic route encapsulation (GRE) has defined the agreement of any one other network layer protocol of encapsulation on any one network layer protocol.
Under the most conventional situation, system has a payload (or load) bag, need and be sent to certain destination with its encapsulation.At first payload is encapsulated in GRE bag, then this GRE is sealed and be contained in other certain agreement and transmit.Send out agreement in addition and be the transmission agreement.When IPv4 was used as the transmission of GRE payload, protocol type field must be set to 0x800.When a termination point of a tunnel was sealed off this and contained IPv4 bag as the GRE bag of payload, the destination address in the IPv4 packet header must be used for transmitting bag, and needs to reduce the TTL of payload bag.It should be noted that when transmitting such bag,, the loop phenomenon will occur if the destination address of payload bag is exactly the wrapper (the tunnel other end just) of bag.In this case, must abandon this bag.When the GRE bag is encapsulated among the IPv4, need to use IPv4 agreement 47.
Network security under the GRE is comparatively similar to the IPv4 network security of routine, the route that the route under the GRE adopts IPv4 to use originally, but route filtering remains unchanged.Packet filtering requires fire compartment wall to check the GRE bag, perhaps finishes filter process at the gre tunneling terminal point.Be counted as those this under environment of safety problem, can on fire compartment wall, stop the tunnel.We can say and set up a virtual special line on the internet, directly arrive the opposite end, other equipment and address be can't see in the centre, with regard to liking a tunnel network at two ends are linked together, and route has only a jumping.
Here said tunnel-like is similar to the connection of point-to-point.This mode can make from the Network of many information sources to be transmitted by different tunnels in same infrastructure.Tunneling technique uses point to point protocol to replace exchange to connect, and connects data address by route network.Tunneling technique allow to be authorized the mobile subscriber or the user that authorized access enterprise networks network at any time and any place.
By the foundation in tunnel, can realize:
* data flow is forced to deliver to specific address
* hide the privately owned network address
* on IP network, transmit non-IP packet
*, the data security support is provided
Recently some new tunneling techniques occurred, and in different systems, found application and expand.
For creating the tunnel, the client-server both sides in tunnel must use identical tunnel protocol.Tunneling technique can be respectively based on the 2nd layer or the 3rd layer tunnel protocol.Layer 2 tunneling protocol uses frame as exchanges data unit corresponding to the data link layer of osi model.PPTP (Point to Point Tunnel Protocol), L2TP (Level 2 Tunnel Protocol) and L2F (Layer 2 Forwarding Protocol(L2F)) belong to layer 2 tunneling protocol, are user data to be encapsulated in the PPP(Point-to-Point Protocol) frame send by the Internet.The 3rd layer tunnel protocol uses bag as exchanges data unit corresponding to the network layer of osi model.IPIP (IP over IP) and ipsec tunnel pattern belong to the 3rd layer tunnel protocol, are IP to be sealed be contained in the additional IP packet header, transmit by IP network.Which kind of tunnel protocol all is made up of the carrier of transmission, different encapsulation format and user data package.Their essential distinction is the user's data bag is to be encapsulated in which kind of packet to transmit in the tunnel.What present technique was used is the gre tunneling agreement.
If the tunneling technique that adopts, its fail safe also is very perfect, the protection the when the inside comprises the cipher key change of ike negotiation, and encryption can be selected very popular des now for use, 3des, aes encrypts.The technology that ensures the data integrity has MD5, SHA.Identity validation technology has the peers include both authentication.Also can adopt encryption technology in the process of transfer of data, encryption can be selected very popular des now for use, 3des, and aes encrypts.The technology that ensures the data integrity has MD5, SHA.Like this during the transmitting on satellite of client's data, even known by cankered people and to accept frequency, received data with same equipment, he also can't see data because data when transmission through encrypting.He is not critical to know authentication password, and the encryption of ike negotiation and the cipher mode of data integrity also will be known the encryption of data and the cipher mode of integrality, so just can provide good fail safe, also just need not provide crypto in addition again.
Adopt the shortcoming of encryption technology to be exactly, can bring temporal delay to transfer of data, concrete delay will judge that cipher mode is complicated more according to the complexity of cryptographic algorithm, and the delay that brings is also just big more, and this needs to test under the actual again environment.But can not adopt encryption, the delay that brings has not so just existed yet.
The utility model combines with the network equipment by the DVB-RCS system, by the gre tunneling technology, satellite network is masked, make the client in the process of communication, can't see address in the satellite network, a virtual tunnel is only seen in the centre, just can arrive client's ground network.When the communication terminal device of near-end wants to visit client's local area network (LAN) (can be privately owned address) of far-end, at first packet is sent to the near-end router, the near-end router is checked route, the destination address that discovery will arrive is to walk the client local area network (LAN) that the tunnel arrives far-end, the packet that this moment, the near-end router sent to the other side's Intranet with needs be encapsulated in once more satellite network can the recognition data bag in; The near-end router is by the IP address of opposite end, route querying tunnel then, find the address after, send on the satellite communication machine; The satellite communication machine is only known the target far-end router that these data is sent to the tunnel far-end, and this address can be routed in satellite network; So, when this packet arrived the target far-end router, far-end router knew that this packet is the other end from the tunnel, and this moment, far-end router was opened packet, check the IP address that really needs arrival, far-end router sends to the destination to this packet.
Also can realize the renewal of dynamic routing by this tunnel, so just allow to use in client's local area network (LAN) dynamic routing.Certainly, also support the route between different segment.
The utility model comprises main station unit, communication satellite, satellite transmission center; The near-end satellite receives transmitter unit, near-end satellite communication machine, near-end frequency converter; Auxiliary unit, near-end video conference terminal, near-end terminal; The near-end router; Ground LAN, far-end video conference terminal, far-end computer terminal; Far-end router; The far-end satellite receives transmitter unit, far-end satellite communication machine, far-end frequency converter; Wherein, main station unit receives transmitter unit and links to each other by wireless transmission and near-end satellite reception transmitter unit, far-end satellite respectively, the near-end router links to each other with near-end satellite reception transmitter unit, auxiliary unit respectively by netting twine, and far-end router links to each other with far-end satellite reception transmitter unit, ground LAN respectively by netting twine.
Described main station unit comprises communication satellite, satellite transmission center; Communication satellite receives the Radio Satellite signal that sends from the satellite transmission center, and this Radio Satellite signal is sent to far-end satellite reception transmitter unit.
Described near-end router is the router that can realize the secondary encapsulation.Satellite is accepted transmitter unit and is connected by common netting twine with ground network equipment.
Described far-end satellite receives transmitter unit and comprises far-end satellite communication machine, far-end frequency converter.
Described auxiliary unit comprises video conference terminal and terminal, also finally is connected by cable and distributor with satellite receiving computer terminal by recombination line or the interconnection of S terminal line.
Described ground LAN: comprise video conference terminal and terminal.
Beneficial effect: the beneficial effects of the utility model comprise that the communication in the satellite network can merge mutually with client's local area network (LAN), make things convenient for the use of client to satellite network.Can allow the client on existing basis, expand the communication mode of oneself.Do not need to change original local area network (LAN) planning, reduce cost: employed hardware all is standard hardware under the existing environment, need not reequip; Broad covered area: the zone that satellite and netting twine can cover can be suitable for the utility model; The communication mode of world looped network is satellite network and the seamless communication products that merge of ground network; Make multi-communication mode more convenient, more various, efficient is higher.
Description of drawings
Fig. 1 is a structure drawing of device of the present utility model.Wherein have: main station unit 1, communication satellite 11, satellite transmission center 12; The near-end satellite receives transmitter unit 2, near-end satellite communication machine 21, near-end frequency converter 22; Auxiliary unit 3, near-end video conference terminal 31, near-end terminal 32; The near-end router four; Ground LAN 5, far-end video conference terminal 52, far-end computer terminal 51; Far-end router 6; The far-end satellite receives transmitter unit 7, far-end satellite communication machine 71, far-end frequency converter 72.
Embodiment
This specific embodiment combination technology scheme and accompanying drawing describe in further detail practical application of the present utility model.
As shown in drawings: the utility model comprises that main station unit 1, near-end satellite receive transmitter unit 2, near-end router four and auxiliary unit 3; Wherein near-end satellite reception transmitter unit 2 carries out the satellite-signal transmission to far-end satellite reception transmitter unit 2, and the near-end router four links to each other with ground LAN 5 by netting twine.
Described main station unit 1 comprises communication satellite 11, satellite transmission center 12; Communication satellite 11 receives from the near-end satellite and receives the Radio Satellite signal that transmitter unit 2 sends, and this Radio Satellite signal is sent to far-end satellite reception transmitter unit 7.
Described near-end satellite receives transmitter unit 2 and comprises near-end satellite communication machine 21 and near-end frequency converter 22.
Both interconnect described near-end router four ground LAN 5 networks by netting twine.
Described auxiliary unit 3 comprises near-end video conference terminal 31 and near-end terminal 32, and near-end terminal 32 is connected with the near-end router four by netting twine.
The utility model practical application hardware environment is as follows:
Communication satellite 11: No. four satellites in Asia;
The near-end satellite receives transmitter unit 2: 1.8 meters antennas of Chengdu nova and centre halfback's 11300 feed frequency converters thereof; Near-end router four: need to support the GRE technology.
Ground-based computer terminal 32: be the terminal of standard, built-in central processing unit is Celeron 1.7Ghz, in save as 256MB, hard disk is 40GB;
Video conference terminal: adopt the polycom7000s video conference terminal.
Afterwards by on-the-spot test, concrete effect is as follows with above-mentioned hardware connection:
Near-end video conference terminal 31 in the auxiliary unit 3 far-end video conference terminal in the local area network (LAN) 5 52 earthward sends video/audio signals, generally is by point-to-point mode.Auxiliary unit 3 links to each other by netting twine with the near-end router four.Auxiliary unit 3 converts the analog signal of video to digital signal by oneself hardware earlier, by netting twine signal is packaged into packet then and passes to the near-end router four, the near-end router four is checked the header packet information in the packet, the destination address that discovery will arrive is to go in the tunnel, the packet that this moment, the near-end router four sent to the other side's Intranet with needs be encapsulated in once more satellite network can the recognition data bag in, send to the satellite communication machine 21 of near-end, near-end satellite communication machine 21 is modulated into electromagnetic wave signal to the baseband signal in the network and sends to main website list 1, the satellite transmission center 12 of main station unit 1 obtains this electromagnetic wave signal, modulator-demodulator by oneself is modulated into baseband signal to electromagnetic wave signal, main website is by the router route data packets of oneself, the modulator-demodulator of main website is modulated into electromagnetic wave signal to the baseband signal in the network and is transmitted on the communication satellite 11 in the main station unit 1 again then, the far-end satellite receives transmitter unit 7 and receives electromagnetic wave signal, electromagnetic wave signal is demodulated to baseband signal, the destination address of far-end satellite communication machine 71 read data packet, local destination address is sought in port broadcasting by itself, far-end router 6 receives the signal of far-end satellite communication machine 71, check the routing table of itself, find this packet and be the other end from the tunnel, this moment, far-end router 6 was opened packet, check the IP address that really needs arrival, change the packet header of packet then, send packet from the interface that is connected to ground LAN 5, packet arrives the far-end video conference terminal 52 in the ground LAN 5, far-end video conference terminal 52 becomes analog signal to digital demodulation signal by the hardware of itself, output on the local display by video-out port itself and to finish communication, through the test video smoothness, lamprophonia, the data smoothness.
The method of utilizing satellite network to set up private LAN is:
The first step: the video and audio equipment of the near-end video conference terminal in the auxiliary unit in the ground LAN of far-end sends video/audio signal, generally is by point-to-point mode.Auxiliary unit links to each other by netting twine with the near-end router.Auxiliary unit earlier becomes digital signal to the analog signal of video by oneself hardware conversion, by netting twine signal is packaged into packet then and passes to the near-end router.
Second step: the near-end router is checked the header packet information in the packet, and whether the destination address that discovery will arrive needs is gone in the tunnel.If not walking the tunnel just directly is transferred in satellite on the active router of main website.
The 3rd step: the packet that the near-end router sends to the other side's Intranet with needs be encapsulated in once more satellite network can the recognition data bag in.
The 4th step: the near-end router sends to these packets in the virtual tunnel, exactly the packet through the secondary encapsulation is sent to near-end satellite communication machine,
The 5th step: near-end satellite communication machine is modulated into electromagnetic wave signal to the baseband signal in the network and sends to main station unit.After the packet of walking tunnel transmission arrives the active router of main website, because this packet is packed twice, the main website router can not be seen in the packet information about the tunnel, destination address in the main website router read data packet, be routed to the destination then, arrive the router of only enabling the GRE function behind the destination and just can obtain tunnel information in the packet.
The 6th step: the satellite transmission center of main station unit obtains this electromagnetic wave signal, by oneself modulator-demodulator electromagnetic wave signal is modulated into baseband signal.
The 7th step: main website is by the router route data packets of oneself, if destination address is not the address in the satellite network, router sends to packet on the router of the Internet outlet.
The 8th step: destination address is the address in the satellite network, and router sends to packet on the modulator-demodulator of main website, and the modulator-demodulator of main website is modulated into electromagnetic wave signal to the baseband signal in the network and is transmitted on the communication satellite in the main station unit again.
The 9th step: the far-end satellite receives the electromagnetic wave signal that transmitter unit receives communication satellite, and electromagnetic wave signal is demodulated to baseband signal, and the destination address of the machine-readable data fetch packet of far-end satellite communication is sought local destination address by the port broadcasting of itself.
The tenth step: far-end router receives the signal of far-end satellite communication machine,
The 11 step: far-end router is checked routing table itself, judges that this packet whether from the other end in tunnel, if these packets do not come to the tunnel, just handles these packets according to normal packet.
The 12 step: if these packets come to the tunnel, this moment, far-end router was opened packet, checked the IP address that packet really need arrive, and reexamined the routing table of itself, sent packet from the interface that is connected to ground LAN,
The 13 step: packet arrives far-end video conference terminal in the ground LAN, the far-end video conference terminal becomes analog signal to digital demodulation signal by the hardware of itself, output on the local display by video-out port itself and to finish communication, through the test video smoothness, lamprophonia, the data smoothness.
Claims (3)
1, a kind of device that can realize that satellite network and ground LAN interconnect is characterized in that this device comprises main station unit (1), communication satellite (11), satellite transmission center (12); The near-end satellite receives transmitter unit (2), near-end satellite communication machine (21), near-end frequency converter (22); Auxiliary unit (3), near-end video conference terminal (31), near-end terminal (32); Near-end router (4); Ground LAN (5), far-end video conference terminal (52), far-end computer terminal (51); Far-end router (6); The far-end satellite receives transmitter unit (7), far-end satellite communication machine (71), far-end frequency converter (72); Wherein, main station unit (1) receives transmitter unit (7) and links to each other by wireless transmission and near-end satellite reception transmitter unit (2), far-end satellite respectively, near-end router (4) links to each other with near-end satellite reception transmitter unit (2), auxiliary unit (3) respectively by netting twine, and far-end router (6) links to each other with far-end satellite reception transmitter unit (7), ground LAN (5) respectively by netting twine.
2, the device that can realize that satellite network and ground LAN interconnect according to claim 1 is characterized in that described main station unit (1) comprises communication satellite (11), satellite transmission center (12); Communication satellite (11) receives the Radio Satellite signal that sends from satellite transmission center (12), and this Radio Satellite signal is sent to far-end satellite reception transmitter unit (7).
3, the device that can realize that satellite network and ground LAN interconnect according to claim 1 is characterized in that described near-end router (4) is the router that can realize the secondary encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200453986U CN201114131Y (en) | 2007-08-29 | 2007-08-29 | Device for accomplishing satellite net and ground local area network interconnecting and communicating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200453986U CN201114131Y (en) | 2007-08-29 | 2007-08-29 | Device for accomplishing satellite net and ground local area network interconnecting and communicating |
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| CN201114131Y true CN201114131Y (en) | 2008-09-10 |
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| CNU2007200453986U Expired - Fee Related CN201114131Y (en) | 2007-08-29 | 2007-08-29 | Device for accomplishing satellite net and ground local area network interconnecting and communicating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105723784A (en) * | 2014-03-03 | 2016-06-29 | 柏思科技有限公司 | Methods and systems for transmitting and receiving data through tunnel groups |
| CN106789299A (en) * | 2016-12-29 | 2017-05-31 | 电信科学技术第研究所 | A kind of satellite remote station management system |
| US11582814B2 (en) | 2014-06-25 | 2023-02-14 | Pismo Labs Technology Limited | Methods and systems for transmitting and receiving data through one or more tunnels for packets satisfying one or more conditions |
-
2007
- 2007-08-29 CN CNU2007200453986U patent/CN201114131Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105723784A (en) * | 2014-03-03 | 2016-06-29 | 柏思科技有限公司 | Methods and systems for transmitting and receiving data through tunnel groups |
| US10291431B2 (en) | 2014-03-03 | 2019-05-14 | Pismo Labs Technology Limited | Methods and systems for transmitting and receiving data through tunnel groups |
| CN105723784B (en) * | 2014-03-03 | 2021-01-12 | 柏思科技有限公司 | Method and system for transmitting and receiving data through tunnel group |
| US11582814B2 (en) | 2014-06-25 | 2023-02-14 | Pismo Labs Technology Limited | Methods and systems for transmitting and receiving data through one or more tunnels for packets satisfying one or more conditions |
| CN106789299A (en) * | 2016-12-29 | 2017-05-31 | 电信科学技术第研究所 | A kind of satellite remote station management system |
| CN106789299B (en) * | 2016-12-29 | 2019-10-25 | 电信科学技术第一研究所有限公司 | A kind of satellite remote station management system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20130829 |