See the traffic behind every slowdown with NetFlow Analyzer

Slow applications, buffering video calls, and constant user complaints often leave IT teams without clear answers. Basic speed tests only show surface level numbers and fail to reveal which users, applications, or devices are actually consuming bandwidth and causing slowdowns. Without real time visibility into network speed and traffic behaviour, troubleshooting becomes reactive, making it harder to identify bottlenecks, verify ISP performance, and ensure critical applications get the bandwidth they need.

ManageEngine NetFlow Analyzer gives you complete visibility into network throughput, bandwidth usage, and traffic patterns across your infrastructure. Instead of relying on surface level metrics, it shows exactly where congestion originates, which applications impact performance, and how network speed behaves across interfaces, WAN links, and locations. With deep, real time analytics, you can quickly detect slowdowns, identify root causes, prioritise critical traffic, and maintain consistent network performance without guesswork or lengthy troubleshooting.

Powerful network speed monitoring
with NetFlow Analyzer

Detect interface saturation and speed drops instantly

Network slowdowns often begin at the interface or WAN link level. NetFlow Analyzer continuously monitors throughput, utilisation, and traffic rates across routers, switches, firewalls, and WAN interfaces using flow technologies such as NetFlow, sFlow, and IPFIX.

This enables teams to quickly identify saturated links, abnormal traffic bursts, and performance drops at their source, ensuring faster isolation of network speed issues.

NetSpeed Tracker Report
Last 24 hours
Speed
UploadDownload
50403020100Mbps13:3415:3117:2819:2521:2223:1901:1604:31
Time ( HH:MM )
Time ↑UploadDownloadUpload VolumeDownload VolumeJitter (ms)Latency (ms)
2022-11-10 00:35:0051.532 Mbps49.510 Mbps57.666 MB63.900 MB3.780.09
2022-11-10 00:50:0052.331 Mbps50.097 Mbps78.637 MB65.623 MB3.720.07
2022-11-09 13:35:0050.270 Mbps51.145 Mbps65.756 MB68.445 MB4.182.19
2022-11-09 13:40:0051.326 Mbps49.652 Mbps56.502 MB63.413 MB3.632.87
2022-11-09 13:45:0050.538 Mbps50.701 Mbps64.474 MB61.752 MB3.760.17
2022-11-09 13:50:0024.798 Mbps34.533 Mbps43.087 MB46.029 MB10.385.88

Identify bandwidth-consuming applications and users

Understanding what consumes bandwidth is critical to maintaining consistent network performance. NetFlow Analyzer provides deep application and user-level visibility using advanced Layer 7 traffic classification and CBQoS support.

IT teams can analyse top applications, conversations, and endpoints impacting bandwidth, making it easier to prioritise business-critical traffic and control non-essential usage.

Overview ApplicationUsersConversationsProtocols
Top N ApplicationHourly Report
YouTube2.4 GB
MS Teams1.8 GB
Google1.2 GB
Netflix890 MB
Other640 MB
Top N UsersHourly Report
192.168.1.45
2.4 GB
192.168.1.112
1.8 GB
192.168.1.78
1.2 GB
192.168.1.203
890 MB
192.168.1.8
640 MB

Pinpoint congestion across the network path

Network bottlenecks often occur across multiple devices and segments. NetFlow Analyzer delivers end-to-end traffic visibility by analysing flow records across the infrastructure.

This helps teams trace traffic paths, locate congestion points, and identify exactly where performance degradation occurs across core, distribution, and edge layers.

Interface Traffic Graph 1 Congestion Detected
Last 6 hours
GigabitEthernet0/1 — Core-Router-01
InOutCongestion
900M700M500M300M100M0bps10:0010:3011:0011:3012:0012:3013:0013:30
Time ( HH:MM )
InterfaceDeviceIn RateOut RateUtilizationStatus
GigabitEthernet0/1Core-Router-01840 Mbps620 Mbps84%Critical
GigabitEthernet0/2Core-Router-01490 Mbps320 Mbps49%Warning
GigabitEthernet0/24Dist-Switch-01380 Mbps210 Mbps38%Normal
GigabitEthernet1/1Edge-Router-01210 Mbps180 Mbps21%Normal
FastEthernet0/8Access-SW-0195 Mbps48 Mbps10%Normal

Maintain consistent speed across WAN and branch locations

Performance inconsistencies frequently originate from WAN links, VPN tunnels, or branch locations. NetFlow Analyzer provides centralised visibility into bandwidth usage and link utilisation across all sites.

With site and link-wise insights, teams can quickly detect overloaded links, optimise traffic distribution, and maintain consistent performance across remote and hybrid networks.

Devices (12)Interfaces (11)Groups (11)Apps•••
Last Hour
Interface Status
Link Up8
Unknown1
Link Down1
Link Up & NoFlows1
11
Interfaces Type
Others
7
Ethernets
3
tunnel
1
StatusInterface NameRouter NameIN UtilizationOUT UtilizationIN SpeedOUT SpeedAlert
GigabitEthernet0/1DataCentreAVC-Mains…
0%
1%
49.787 bps52.303 bps0
GigabitEthernet0/1/1DataCentreAVCMains-…
0%
0%
9.286 bps9.371 bps0
GigabitEthernet0/1/1DataCentreBasicV9-N…
10%
51%
1.020 Kbps511.154 bps0
GigabitEthernet0/1/2DataCentreBasicV9ipv…
5%
5%
1.006 Kbps1.011 Kbps0
GigabitEthernet0/2DataCentreBasicV9ipv…
100%
>100%
1.003 Kbps1.024 Kbps0
GigabitEthernet0/1/2DataCentreipV4Bi-ASA
>100%
>100%
14.819 Kbps14.786 Kbps0
GigabitEthernetBIASA…DataCentreipV6Bi-ASA
20%
20%
19.882 Kbps19.907 Kbps0
ASAGigabitEthernet0/1DataCentreV9ASA.me…
>100%
>100%
1.001 Kbps1.004 Kbps0
MediaGigabitEthernet…DataCentreV9Mediane…
51%
50%
1.011 Kbps996.705 bps0
MultiGigabitEthernet0/1DataCentreV9Multicast
>100%
20%
1.015 Kbps1.014 Kbps0
!IfIndex1Viptela_SD-WAN
0%
0%
0.000 bps0.000 bps0

Analyse performance trends and plan capacity effectively

Short-term fixes are not enough to maintain long-term network speed. NetFlow Analyzer stores historical traffic and bandwidth data to reveal recurring congestion patterns, peak usage trends, and capacity constraints.

These insights support proactive bandwidth planning, infrastructure upgrades, and long-term performance optimisation based on real network behaviour.

Capacity Planning ReportDataCentreV9Basic-ASA / GigabitEthernet0/1
VolumeSpeedUtilizationPackets
Last 24 hours
bps10.80.60.40.2005:0007:0009:0011:0013:0015:0017:0019:0021:0023:0001:0003:00Time ( HH:MM )
TRUNK-1_App
IDPR_App
RDP_App
TRUNK-2_App
XNS_IDP_App
MUX_App
IPENCAP_App
IRTP_App
ST_App
EMCON_App
Application ↕05:0007:0009:0011:0013:0015:0017:0019:0021:0023:0001:0003:0005:00
TRUNK-1_App0.087 bps0.487 bps0.389 bps-0.289 bps0.364 bps0.842 bps0.253 bps0.938 bps0.378 bps0.100 bps1.029 bps-
IDPR_App0.182 bps0.584 bps0.638 bps0.380 bps0.149 bps0.720 bps0.349 bps0.702 bps0.236 bps0.162 bps0.296 bps0.436 bps-
RDP_App0.049 bps0.300 bps0.393 bps1.124 bps0.040 bps0.251 bps0.620 bps-0.540 bps0.436 bps0.776 bps0.300 bps-
XNS-IDP_App0.513 bps0.291 bps0.113 bps0.164 bps0.929 bps0.304 bps0.844 bps0.840 bps0.280 bps0.138 bps0.151 bps0.202 bps-
TRUNK-2_App-0.789 bps0.231 bps0.513 bps0.044 bps0.042 bps0.838 bps0.858 bps0.389 bps0.547 bps0.222 bps0.298 bps-
MUX_App0.242 bps0.569 bps0.873 bps0.178 bps0.113 bps0.073 bps0.082 bps0.422 bps0.284 bps0.462 bps1.000 bps0.424 bps-
IPENCAP_App0.160 bps0.142 bps0.873 bps0.220 bps0.242 bps0.596 bps1.058 bps0.249 bps0.198 bps0.547 bps0.311 bps0.857 bps-
IRTP_App0.082 bps0.200 bps0.180 bps0.330 bps0.370 bps0.280 bps0.520 bps0.430 bps0.480 bps0.380 bps0.150 bps0.470 bps-

Prevent slowdowns with intelligent alerts and proactive monitoring

Continuous monitoring and early detection are essential to maintaining network performance. NetFlow Analyzer enables threshold-based alerts for utilisation spikes, abnormal traffic patterns, and speed drops.

With real-time notifications and detailed analytics, teams can detect emerging issues early, resolve them faster, and ensure consistent network performance across the infrastructure.

52
18
32
2
0
3
Active Alarms (52)
AlarmSourceTypeAssigneeSeverityTime
Incompatible NPS request detected for 5000076850000768SystemUnAssignedCritical10 min ago
Configuration Changed at Mar 27, 2023 1…UnknownConfigUnAssignedCritical1 hour ago
Configuration Changed at Mar 26, 2023 0…UnknownConfigUnAssignedCritical1 day ago
Interface GigabitEthernet0/0[CiscoRouter7…CiscoRouter7…Link DownUnAssignedCritical21 days ago
Interface FastEthernet0/1[CiscoRouter28013…CiscoRouter28013…Link DownUnAssignedCritical136 days ago
- Wan1 (Wan2) :::: Availability threshold…UnknownThresholdUnAssignedCritical159 days ago
- Voip1 (Voip1) :::: MOS threshold limit vi…UnknownThresholdUnAssignedCritical321 days ago
2.0 packets transferred (violated threshold…5.5.5.9Realtime AlertadminTrouble1 year ago
2.0 packets transferred (violated threshold…5.5.5.9Realtime AlertUnAssignedTrouble1 year ago
80.0 packets transferred (violated threshold…5.5.5.2Realtime AlertUnAssignedTrouble1 year ago
3.0 packets transferred (violated threshold…MedianetRealtime AlertUnAssignedTrouble1 year ago
63.0 packets transferred (violated threshold…MulticastRealtime AlertUnAssignedTrouble1 year ago
50.0 packets transferred (violated threshold…5.5.5.5Realtime AlertUnAssignedAttention1 year ago

Real-time network speed issues
resolved with NetFlow Analyzer

A sudden slowdown disrupts the entire office

Problem

Multiple teams reported slow applications and lag during video calls. Bandwidth usage appeared normal, yet performance continued to drop.

How NetFlow Analyzer helped

The IT team used NetFlow Analyzer to view real-time traffic across the network. Within minutes, a large file transfer and non-business streaming traffic consuming bandwidth on a core interface were identified. By prioritising critical applications and controlling unnecessary traffic, performance was restored without prolonged downtime.

Video conferencing fails during an important client meeting

Problem

During peak hours, video calls began buffering and disconnecting across departments. The IT team needed immediate clarity on what was affecting performance.

How NetFlow Analyzer helped

Live application traffic analysis revealed a scheduled backup consuming significant bandwidth across the WAN link. After rescheduling the backup and reallocating bandwidth, video conferencing returned to normal without further disruption.

Branch office users report inconsistent speed

Problem

Employees in a remote branch started experiencing intermittent slowness while accessing cloud applications. The issue could not be replicated at headquarters, making troubleshooting difficult.

How NetFlow Analyzer helped

The team monitored speed across branch links and quickly identified congestion on a specific WAN interface during peak usage. By rerouting traffic and optimising bandwidth allocation, consistent performance was restored across the branch.

Unusual bandwidth spike affects critical apps

Problem

Network performance dropped unexpectedly one afternoon, impacting access to essential business applications with no obvious cause.

How NetFlow Analyzer helped

NetFlow Analyzer detected a sudden spike caused by a newly installed application generating heavy background traffic. Real-time alerts and traffic analysis helped isolate the source and control bandwidth consumption immediately, preventing further disruption to critical services.

Why NetFlow Analyzer stands out as a
network speed monitor

Correlates flow data across the entire network

Analyses NetFlow, sFlow, IPFIX, and other flow exports to provide detailed visibility into traffic behaviour across routers, switches, and firewalls.

Identifies top applications, conversations, and endpoints

Provides granular insights into which applications, users, and IPs consume bandwidth, enabling precise root cause identification during slowdowns.

Pinpoints congestion across interfaces and WAN links

Tracks utilisation and throughput across interfaces and site-to-site links to help isolate exactly where performance degradation occurs.

Delivers centralised visibility for distributed environments

Monitors traffic patterns and link utilisation across data centres, branch offices, VPNs, and hybrid infrastructures from a single console.

Supports historical traffic analysis and capacity planning

Stores and analyses long-term bandwidth and performance data to identify recurring congestion trends and plan upgrades based on actual usage.

Enables threshold-based alerts and performance monitoring

Generates alerts for utilisation spikes, abnormal traffic patterns, and speed drops, allowing faster detection and response to emerging issues.

Key metrics to monitor network speed

Bandwidth utilisation

Throughput

Latency

Packet loss

Jitter

Application bandwidth consumption

Top talkers and endpoints

WAN and interface performance

Benefits of monitoring network speed with NetFlow Analyzer

Accelerated root cause identification

Quickly isolate bandwidth bottlenecks, top talkers, and congestion points using real-time and historical traffic analysis, reducing dependency on manual troubleshooting.

Optimised bandwidth for critical applications

Gain clear visibility into application and user-level consumption to prioritise business-critical traffic and prevent non-essential usage from impacting performance.

Proactive performance management

Detect utilisation spikes, abnormal traffic patterns, and speed drops early with continuous monitoring and intelligent alerts to prevent user impact.

Data-driven capacity and ISP management

Validate service provider performance, analyse long-term traffic trends, and plan bandwidth upgrades confidently using detailed historical insights.

See the traffic behind every performance issue
with NetFlow Analyzer

NetFlow Analyzer security and compliance

Safeguarding your network and data, at once

NetFlow Analyzer keeps your network and data safe with advanced encryption and authentication standards. Features like SSL configuration, password protection, and trusted certificates help secure your network at every layer.

NetFlow Analyzer complies with the following data security standards

  • GDPR
  • FIPS 140-2
  • ISO/IEC 27001

Case study

An Italian luxury vehicle manufacturer needed a unified solution to manage its large, complex network — supporting video conferencing and MPLS while preparing for future growth. ManageEngine NetFlow Analyzer met all their needs with a user-friendly interface, advanced monitoring capabilities, and smooth integration, becoming the top choice for scalable network management.

NetFlow Analyzer case study