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IP Networking Over Data Links

IP Networking Over Data Links. Time Critical/Mission Critical Network Equipment. By Dr. Larisa Tsirinsky. Agenda. IP over wireless. General Military vs. Civilian IP networks Standardization of military IP networks Compliance with International Standards COTS Interoperable Equipment

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IP Networking Over Data Links

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  1. IP Networking Over Data Links Time Critical/Mission Critical Network Equipment By Dr. Larisa Tsirinsky

  2. Agenda • IP over wireless. General • Military vs. Civilian IP networks • Standardization of military IP networks • Compliance with International Standards • COTS Interoperable Equipment • Military Performance (Time critical and/or Mission critical) • Summary

  3. Agenda • IP over wireless. General • Military vs. Civilian IP networks • Standardization of military IP networks • Compliance with International Standards • COTS Interoperable Equipment • Military Performance (Time critical and/or Mission critical) • Summary

  4. Communication Standardsare Widely Spread • Control networks • Accessibility • Security • Safety • Quality of Service • Created by several standard organizations (ITU, IETF, IEEE, …) • Implementation ready

  5. Standard Network Equipment Comply with international standards Interoperable Available Non-expensive Validated and inspected Verified by millions of users

  6. Wireless IP Networks Pose Multiple Challenges • Universal Internet Connections • Main problems • High Latency • High BER • Bandwidth Variations • Link Losses • Security issues

  7. Agenda • IP over wireless. General • Military vs. Civilian IP networks • Standardization of military IP networks • Compliance with International Standards • COTS Interoperable Equipment • Military Performance (Time critical and/or Mission critical) • Summary

  8. Military Networks Yet Additional Problems • Unstable end-to-end connectivity between source and destination • Limited bandwidth allowance per source / destination • Strict prioritization requirements • Hard real-time requirements • Traffic and protocols restrictions because of special military network devices (gateways, encoders, firewalls, etc.) • Transmitting Multicast over Encryption dedicated devices • One way transmission for High security networks (Black • classification) • No “implementation ready” standards

  9. Agenda • IP over wireless. General • Military vs. Civilian IP networks • Standardization of military IP networks • Compliance with International Standards • COTS Interoperable Equipment • Military Performance (Time critical and/or Mission critical) • Summary

  10. Military Smart Gateway Tactical Linker solves most connectivity problems • Provides network connectivity for time-critical/mission-critical systems • Enables commercial open network architecture to migrate and comply to tactical military network requirements • Provides security demands that comply to military standards • Fully transparent to other network entities • Does not interfere the network traffic • Negligible latency • Fully rugged military device • Leverages “civilian” network to a “military” grade network solution

  11. Operational Environment (Example)

  12. Tactical Application Features (1/2) • Saves the traffic in the case of link loss • Link Recovery – No data loose even after several minutes of total link disconnection • Automatic recovery after full communication loss • Quality of Service for mission critical data • Guaranteed Delivery • Order Control • Prioritization for unstable variable bandwidth based on payload

  13. Tactical Application Features (2/2) • Redirection of selected traffic to one or several destinations • Transmission of Multicast over any Military unicast device • Deep Packet Inspection • Provides tactical communication over commercial wireless

  14. Services (1/7)Precise BW management • Bandwidth management – precise BW estimation • “Not to exceed” Data Link Capacity • Adjustment to the Variable Data Link Bandwidth • Traffic shaping • Smoothing • Data Link requirement for an equal distribution of the traffic. E.g., Total BW 50 Mbps and smoothing interval 5 msec mean that about 250 Kb should be sent every 5 msec • Stuffing • May be used if the total downlinked/uplinked traffic is less than minimal Data Link requirement • Filler data packets are generated to stuff the traffic

  15. Services (2/7)Traffic Adjustment • Bandwidth per channel (source IP, port & destination IP, port) • Strict allocation – each channel uses only its pre-allocated BW • Best effort - extra traffic may be sent on account of other channel(s) • Dropping Policy • Time of Life (ToL) • Defines the size of internal buffer to keep the extra traffic • If the real traffic is constantly bigger than the allowed traffic during ToL interval the extra packets should be dropped according to channel priority and • Order of packets dropping • Oldest packet is dropped first • Newest packet is dropped first

  16. Services (3/7)Critical Messages to the Head of Queue Priority • Each channel has its own queue • The scheduler arranges the packets by their priority and delivers them to the transmitting buffer

  17. Services (4/7)QoS for Critical Traffic • Guaranteed Delivery and Order Control • UDP transport is most commonly used for IP over wireless • Connectionless unreliable transport • Fast packets delivery time (compare to TCP) • No flow control! • No sequencing! • Optimized TCP may be applied only to selected traffic (channels) • Internal handshakes are implemented between source and destination gateways • Allow to avoid packet loss and “out-of-order” packets for selected traffic

  18. Services (5/7)Multicast Traffic over Unicast Devices • Network Traffic Redirection • Direct traffic to external devices • Transmit unicast to multiple IP destinations • Convert unicast to multicast • Redirect traffic selectively, based on policy, to avoid service device overload

  19. Services (6/7)Load Balancing • Load Balancing • More than one wireless channels are available • Traffic may be sent to the predefined channel or to the automatically selected channel according to: • Available Bandwidth • Average Data Transportation Time • Channel delays

  20. Services 7/7Deep Packet Inspection • Seamless Statefull Packet Inspection based on layers 3-7 data • Application Layer Protocols • V2oIP • GPRS • GTP • SMTP • HTTP • Etc • Data Pattern(s)

  21. Agenda • IP over wireless. General • Military vs. Civilian IP networks • Standardization of military IP networks • Compliance with International Standards • COTS Interoperable Equipment • Military Performance (Time critical and/or Mission critical) • Summary

  22. Summary Military networks become standard and fully interoperable Plenty of cheap COTS network equipment is available Dramatically reduced number of failures, development cost and time to market Compliance with international standards

  23. Thank you! larisa@embedded-solutions.co.il

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