1. Abdul Wahhab Deputy General Manager(IIG Operation) Bangladesh Submarine Cable Company Limited abdul.wahhab@bsccl.com

2. Backbone Network Network infrastructure connects different network A set of pathways to exchange data between different networks Various network technologies work together Optical Fiber, traditional copper, wireless technologies etc. IP backbone BSCCL

3. Backbone Infrastructure Planning Backbone infrastructure planning can be categorize Transmission backbone Physical connectivity to upstream Physical connectivity to internal devices IP backbone Connectivity with Upstream Connectivity with internal devices Connectivity with clients BSCCL

4. Transmission Backbone-- Example BSCCL is connected to its Upstream through Submarine Cable(SEA-ME-WE-4) BSCCL

5. Transmission Backbone– Example(Cont.) BSCCL

6. IP Backbone Communication depends on IP backbone To connect with outer world connectivity should have two different physical links BGP routing protocol will be the better choice BGP best practice Use filter list Advertise only real IP prefix (>= /24) to upstream For multi-homing rpf(reverse path filter) should be off Never receive full route unless it is necessary BSCCL

7. Network Monitoring Get right information in right time Capture information of current network devices Real time information of physical connectivities to different devices Real time status information of critical servers and services Benefits Reliability, Track records, Utilization & upgradation, Troubleshooting etc. BSCCL

8. What is to Monitor In a large computer network, a network administrator prefers to monitor Availability of network devices Availability of critical services Amount of disk space uses in key servers Routers’ maximum throughput utilization Average memory and processor utilization on key routers/switches/servers Amount of traffic coming in and out of routers and clients Type of traffic passing through the routers BSCCL

9. Monitoring tools Different types of monitoring tools are available Open Source Proprietary Open Source Nagios, Oservium, Centrion etc MRTG, cacti Snort, nfsen Proprietary opmanager, Nagios XI etc Network Defender plus BSCCL

10. Monitoring tools used by BSCCL For network performance monitoring & troubleshooting BSCCL uses Cacti, Solarwind and nfsen Cacti Using for realtime traffic monitoring Solarwind Link status, Service Status, BGP status etc. Nfsen Netflow from source and destination BSCCL

11. Cacti BSCCL

12. Solarwind BSCCL

13. Trouble Shooting Through Cacti it is clearly visualize some unwanted traffic is flowing to and from clients network. BSCCL

14. Trouble Shooting – Example( Cont.) Using nfsen the traffic flow was inspected to diagnosis the incident on mentioned time. BSCCL

15. Thank YOU