Network Infrastructure & Performance Monitoring

Abdul WahhabDeputy General Manager(IIG Operation)

Bangladesh Submarine Cable Company Limitedabdul.wahhab@bsccl.com

Backbone Network

Network infrastructure connects different networkA set of pathways to exchange data between different networksVarious network technologies work together

Optical Fiber, traditional copper, wireless technologies etc.IP backbone

BSCCL

Backbone Infrastructure Planning

Backbone infrastructure planning can be categorize

Transmission backbonePhysical connectivity to upstreamPhysical connectivity to internal devices

IP backbone Connectivity with UpstreamConnectivity with internal devicesConnectivity with clients

BSCCL

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

BSCCL

Transmission Backbone– Example(Cont.)

BSCCL

IP Backbone

Communication depends on IP backboneTo connect with outer world connectivity should have two different physical linksBGP routing protocol will be the better choiceBGP best practice

Use filter list Advertise only real IP prefix (>= /24) to upstreamFor multi-homing rpf(reverse path filter) should be offNever receive full route unless it is necessary

BSCCL

Network Monitoring

Get right information in right timeCapture information of current network devicesReal time information of physical connectivities to different devicesReal time status information of critical servers and servicesBenefits

Reliability, Track records, Utilization & upgradation, Troubleshooting etc.

BSCCL

What is to Monitor In a large computer network, a network administrator prefers to monitor

Availability of network devicesAvailability of critical servicesAmount of disk space uses in key serversRouters’ maximum throughput utilizationAverage memory and processor utilization on key routers/switches/serversAmount of traffic coming in and out of routers and clientsType of traffic passing through the routers

BSCCL

Monitoring toolsDifferent types of monitoring tools are available

Open SourceProprietary

Open SourceNagios, Oservium, Centrion etcMRTG, cacti Snort, nfsen

Proprietaryopmanager, Nagios XI etcNetwork Defender plus

BSCCL

Monitoring tools used by BSCCLFor network performance monitoring & troubleshooting BSCCL uses

Cacti, Solarwind and nfsen

Cacti Using for realtime traffic monitoring

Solarwind Link status, Service Status, BGP status etc.

NfsenNetflow from source and destination

BSCCL

Cacti

BSCCL

Solarwind

BSCCL

Trouble Shooting

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

BSCCL

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

BSCCL

Thank YOU