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Large-Scale Multi-purpose wireless networks

Large-Scale Multi-purpose wireless networks. Stefano Zanoli. MUM Poland 2008. Agenda. Company presentation Wireless Networks: vision and mission Wireless Networks: architecture. Who we are. Small and dynamic company Software Development System Integration WISP. Where we are.

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Large-Scale Multi-purpose wireless networks

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  1. Large-Scale Multi-purpose wireless networks Stefano Zanoli MUM Poland 2008

  2. Agenda • Company presentation • Wireless Networks: vision and mission • Wireless Networks: architecture

  3. Who we are • Small and dynamic company • Software Development • System Integration • WISP

  4. Where we are Borgosesia – Valsesia

  5. Security COAX / Fiber Environment Monitoring Environment Monitoring Hotspots Hotspots Hotspots VHF Security Wireless Infrastructure Wireless networks: our vision • Unique wireless infrastructure supporting multiple services and applications IEEE 802.11 €€€ € €€

  6. Wireless networks: our vision Like a motorway….. Pervasive IP infrastructure supporting multiple services and applications INTERNET TELEMEDICINE TELE MONITOIRNG VOICE AND VIDEO VIDEOSURVEILLANCE

  7. Wireless networks: our vision Environemt Mnitoring Civil protection Broadband Internet Access Wireless Net Intranet Document sharing Application sharing Telemedicine E-health Services for tourists Hotspot, e-guide

  8. Wireless network: our mission • Building robust and affordable wireless infrastructures • Providing Internet and Value Added Services to citizens and public administration

  9. HOW ? Economic issues Organizational issues Technical issues

  10. Architecture

  11. Clients

  12. Client Devices

  13. Client Devices - CPEs • Routerboard 133, 133c • New Routerboard 411 • RouterOS level 3 is enough • Wireless interface as STATION

  14. Access Network

  15. Access Network - Intro • Infrastructure wireless access network • Short point-to-point or point-to-multipoint links • Redundant links (mesh) • Wireless cells for client connections

  16. Access Network - Requirements • How to deal with multiple services? • Every service must have its own “lane” • Traffic of different services must be kept separated • Every service requires a different QoS • Guaranteed throughput • Latency and jitter

  17. Access Network - Architecture • VLANs, WDS, VAP and BRIDGES • Define one VLAN for each service • Use WDS to propagate VLANS on the access network • Use VAP with multiple SSID to provide access to different client devices • Use BRIDGE to join VAP with respective VLAN

  18. Access network - Example

  19. Access Network - Equipment • Routerboard 532, 333 or 600 • Daughterboard 502 or 604 • RouterOS level 4 for APs • RouterOS level 4 or greater for NAS • Wireless interfaces as AP BRIDGE

  20. Wireless Backbone

  21. Wireless Backbone • Must provide performing connection between access networks and Internet or server farm • Long distances and high throughput • NStreme2 with high directional antennas dual-polarity antennas • Channel Bonding • Use 5 GHz band • Optimize your RB resources (E.g. disable CONNTRACK)

  22. Wireless Backbone • It’s the core of your infrastructure, consider redundancy! • Redundant links (mesh) with dynamic routing protocol (E.g. OSPF) • Redundant devices with VRRP • Battery backup

  23. Internet Access

  24. Internet Access • If you have your own AS number and public subnet • Subscribe peering agreements • Configure your BGP router(s) • If you a carrier/ISP provides you Internet connection • Simply connect you gateway to your provider equipment • Configure NAT / MASQUERADE

  25. Internet Access • In both cases you need to keep control on traffic flows to/from Internet • Usually the bottleneck is here! • TRAFFIC SHAPING • Keep P2P traffic under control • Prioritizing interactive traffic (E.g. VoIP) • Differentiating Download and Upload

  26. Internet Access • Traffic classification • Firewall mangle rules: mark connections and mark packet

  27. Internet Access • Queue Tree (HTB)

  28. Interne Access - Equipment • Firewall mangle, NAT and Queues are CPU-intensive task. Monitor your CPU! • Routerboard 1000 • I386 mainboards (mini-itx) or server • RouterOS level 4

  29. Server Farm - RADIUS • RADIUS • Authentication, Authorization and Accounting • FreeRADIUS, • SQL module • Backend DB • Stores user credentials, profiles and accounting info • MySQL

  30. Server Farm – custom app. • WIC Manager • Costumers management and billing • Admin and user access

  31. Server Farm – custom app. • Hotspot Manager • Prepaid coupon for Internet access (nomadic users) • SMS Authentication • Credit Card Payment

  32. Server Farm - Monitoring • Distribuited monitoring • Master server in server farm • Slave server on access network • Mikrotik Dude and Zabbix on linux Server

  33. Server Farm - other • SMTP and POP3 servers • DNS servers • Video servers • Streaming server

  34. Remote Access

  35. Remote Access • Allow manteinance staff to access network remotely • OpenVPN, IPSec

  36. Conclusions • It is technically possible to build large geographical multi-purpose wireless networks • It’s not straightforward, you need strong competences L1-L7 • RouterOS has all features you need and makes network management and maintenance simpler

  37. THANK YOU!! Stefano Zanoli HAL Service s.r.l stefano.zanoli@halservice.it

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