Flowtriq vs Arbor (Netscout):
DDoS detection compared

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Why This Comparison Exists

If you work in network security at an ISP, hosting provider, or large enterprise, there is a good chance you already have Arbor. Netscout's Sightline platform (formerly Arbor Networks Peakflow) has been the standard for network-wide DDoS detection since the early 2000s. When someone on your team suggests adding Flowtriq, the immediate response is usually: "We already have Arbor."

That response is understandable, and it is also based on an incomplete picture. Arbor and Flowtriq were designed for different layers of the problem. Arbor watches your network from a macro perspective using flow telemetry from routers and switches. Flowtriq watches individual servers from the inside. These two perspectives are not interchangeable — they are complementary.

This comparison will be specific about what each product actually does, where each one excels, where each one has blind spots, and how running both fills the gaps that either one alone cannot cover. We sell Flowtriq, so our bias is obvious. We will try to be honest anyway.

What Arbor Sightline Actually Does

Netscout Arbor Sightline is a flow-based DDoS detection and network visibility platform. It ingests NetFlow, sFlow, IPFIX, and other flow telemetry from routers and switches across your network. It builds traffic baselines over time and detects anomalies that match DDoS attack patterns. When it detects an attack, it can trigger automated or manual mitigation through several mechanisms: RTBH (remotely triggered black hole routing), FlowSpec rules, or diversion to Arbor TMS (Threat Mitigation System) appliances for surgical scrubbing.

Sightline's core strengths:

• Network-wide visibility: A single Sightline deployment sees all traffic crossing your routers. For a Tier 2 ISP, this means visibility into hundreds of gigabits of transit traffic without touching individual servers.
• ATLAS threat intelligence: Netscout operates the ATLAS global threat intelligence feed, built from data across their customer base. Sightline uses this to identify known attack patterns and botnets.
• Automated mitigation orchestration: When paired with TMS appliances or FlowSpec-capable routers, Sightline can trigger mitigation automatically — diverting attack traffic to scrubbing centers or dropping it at the network edge.
• Peering and transit analytics: Sightline provides detailed BGP and flow analytics that go far beyond DDoS detection. Many operators use it as a general network traffic engineering tool.
• ISP-scale architecture: Designed for environments processing millions of flows per second from hundreds of routers.

Arbor has earned its position in ISP and large enterprise networks. It is genuinely good at what it does. The ATLAS threat intelligence is unique in the industry. The integration between Sightline detection and TMS scrubbing is mature and well-tested after two decades of production deployments.

Where Arbor Has Blind Spots

Arbor's architecture creates specific visibility gaps that are inherent to the flow-based approach, not implementation failures:

Flow sampling and time granularity. NetFlow and sFlow are sampled protocols. A typical deployment samples 1 in every 1,000 or 1 in every 2,000 packets, then exports flow records in 1-minute or 5-minute intervals. This means Sightline's view of your traffic is both sampled (not every packet is counted) and time-delayed (you see what happened 1-5 minutes ago, not what is happening now). For large volumetric attacks — millions of PPS sustained for minutes — sampling is sufficient to detect the anomaly. For short bursts, low-volume application-layer attacks, or attacks that ramp slowly, the sampling and interval delay can result in detection latency measured in minutes or missed detections entirely.

No per-server visibility. Sightline sees traffic at the router interface level. It knows that a particular /24 prefix is receiving anomalous UDP traffic. It does not know which specific server within that /24 is the target, what process on that server is being impacted, or how the server is handling the load. If you have 50 game servers behind a single router interface, Sightline tells you the subnet is under attack. It does not tell you which game server is being targeted or whether that server's application has already crashed.

No PCAP capture. Flow telemetry is metadata — source IP, destination IP, ports, protocol, byte count, packet count, flow duration. It is not packet data. You cannot download a PCAP from Sightline. When your NOC needs to analyze the actual packets in an attack to understand the payload, determine if it is a specific amplification vector, or provide evidence to an upstream provider, Sightline cannot provide that data.

Limited alerting channels. Sightline's alerting is built around SNMP traps, email, and syslog — the standard enterprise notification mechanisms of the 2000s. Native integration with modern incident response tools like Slack, Discord, PagerDuty, or OpsGenie requires custom middleware or third-party integration. This is not a showstopper for large NOCs that have built their own integration layers, but it is additional operational overhead.

Arbor sees your network like an air traffic controller sees a radar screen — great for the big picture, but it cannot tell you what is happening inside any individual aircraft. Flowtriq is the cockpit instrumentation.

What Flowtriq Does Differently

Flowtriq is a lightweight agent that runs on individual Linux servers. It monitors network traffic directly on the server's network interface, building per-second traffic baselines and detecting anomalies in real time. When it detects an attack, it classifies the attack type, captures a PCAP sample, and sends alerts through your configured channels within seconds.

Flowtriq's core strengths relative to Arbor:

• Per-server granularity: Each node reports its own traffic independently. You know exactly which server is being targeted, what port is receiving the attack traffic, and how that server's traffic compares to its own historical baseline — not a subnet-level aggregate.
• 1-second detection latency: Flowtriq analyzes traffic continuously, not in sampled intervals. Detection fires within 1-2 seconds of anomalous traffic onset. For time-sensitive environments like game servers, voice infrastructure, or financial services, this is the difference between catching an attack before it causes user impact and detecting it after the damage is done.
• Automatic PCAP capture: When an incident triggers, Flowtriq automatically captures a PCAP of the first 60 seconds of attack traffic. This PCAP is available for download directly from the incident page. No separate packet capture infrastructure required, no TAPs, no span ports.
• Attack classification with confidence scoring: Each incident is automatically classified — SYN flood, UDP flood, DNS amplification, NTP amplification, ICMP flood, TCP ACK flood, multi-vector — with a confidence score. Your team does not need to manually analyze flow records to determine the attack type.
• Modern alerting: Native integration with Discord, Slack, PagerDuty, OpsGenie, email, SMS, and custom webhooks. Alerts fire within seconds, not minutes.
• No network infrastructure dependency: Flowtriq does not require NetFlow-capable routers, span ports, or network TAPs. It installs on the server itself. This means it works in environments where you do not control the network infrastructure — colocation, cloud, VPS, or edge deployments.

What Flowtriq does not do: it does not mitigate attacks inline. It does not scrub traffic. It does not provide network-wide flow analytics or BGP routing visibility. It does not have a global threat intelligence feed comparable to ATLAS. These are Arbor's strengths, and we are not trying to replicate them.

Side-by-Side Data Comparison

To make this comparison concrete, consider a real-world scenario: a 90-second DNS amplification attack at 450,000 PPS targeting a single server in a /24 subnet that contains 60 servers. Here is what each product reports.

The data gap is not about one product being better — it is about the fundamental difference between flow telemetry and per-server packet analysis. Flow-based systems trade granularity for scale. Per-server agents trade network-wide breadth for depth on each individual node.

Feature-by-Feature Breakdown

Here is a detailed comparison across the capabilities that matter most for DDoS operations:

• Detection method: Arbor uses sampled flow telemetry (NetFlow/sFlow/IPFIX) from network devices. Flowtriq uses real-time packet analysis on each server's network interface.
• Detection latency: Arbor typically detects within 1-5 minutes depending on flow export intervals and threshold configuration. Flowtriq detects within 1-2 seconds.
• Target identification: Arbor identifies target at the prefix/subnet level. Flowtriq identifies the exact server, port, and protocol.
• Attack classification: Both classify attacks. Arbor's classification is based on flow characteristics (port distributions, protocol ratios). Flowtriq's classification includes packet payload analysis and confidence scoring.
• Traffic data: Arbor provides 1-5 minute aggregated flow data. Flowtriq provides per-second PPS and Mbps time series.
• PCAP capture: Arbor does not capture packets (flow-only). Flowtriq captures 60 seconds automatically per incident.
• Source analysis: Arbor provides top source ASNs from flow data. Flowtriq provides top source IPs, ASNs, and countries from actual packets.
• Mitigation capability: Arbor triggers RTBH, FlowSpec, or TMS scrubbing. Flowtriq does not perform inline mitigation (detection and forensics only).
• Network-wide visibility: Arbor provides full network traffic analytics across all router interfaces. Flowtriq sees only the traffic reaching each individual agent node.
• Threat intelligence: Arbor includes the ATLAS global feed. Flowtriq maintains its own threat intelligence feed focused on DDoS indicators.
• Alerting channels: Arbor uses SNMP traps, email, syslog. Flowtriq uses Discord, Slack, PagerDuty, OpsGenie, email, SMS, webhooks.
• Deployment model: Arbor requires dedicated appliances or VMs and flow-exporting network devices. Flowtriq requires a lightweight agent installed on each server.

Pricing Comparison

Arbor Sightline pricing is not publicly listed and varies significantly by deployment size, but the range is well known in the industry. A typical Sightline deployment for a mid-size ISP or large enterprise starts in the six-figure range for the software license, with annual maintenance and support fees that typically run 18-22% of the license cost per year. Adding TMS scrubbing appliances pushes the total investment into seven figures. Hardware refresh cycles add further cost every 4-5 years.

A representative Arbor deployment for a mid-size network:

• Sightline software license: $150,000 - $500,000+ (varies by flow capacity)
• TMS scrubbing appliance(s): $100,000 - $400,000+ per appliance
• Annual support and maintenance: $50,000 - $150,000+
• Professional services for deployment: $30,000 - $80,000
• Hardware refresh (every 4-5 years): substantial additional cost

This pricing is appropriate for ISPs and large enterprises that need network-wide flow analytics, BGP visibility, and automated scrubbing orchestration. The cost reflects real engineering value.

Flowtriq pricing is straightforward and public: $9.99 per node per month, or $7.99 per node per month on annual billing. A 7-day free trial is included. There is no minimum commitment, no setup fee, no professional services requirement, and no hardware to buy.

• 50 servers: $499.50/month ($4,794/year on annual billing)
• 200 servers: $1,998/month ($19,176/year on annual billing)
• 500 servers: $4,995/month ($47,940/year on annual billing)

These are not competing price points. The pricing reflects the different scope and architecture of each product. Arbor is a network infrastructure platform. Flowtriq is a per-server detection agent. Comparing their cost directly is like comparing the price of a network switch to the price of a server monitoring agent — they operate at different layers.

Hybrid Deployment: Running Both Together

The strongest DDoS detection posture for organizations that already have Arbor is to add Flowtriq as a complementary layer. Here is how this works in practice:

Arbor handles the network layer. Sightline continues to ingest flow telemetry from your routers, providing network-wide traffic analytics, BGP visibility, and macro-level DDoS detection. When large volumetric attacks are detected, Sightline triggers TMS scrubbing or FlowSpec rules to mitigate at the network edge. This is what Arbor was designed for, and it does it well.

Flowtriq handles the server layer. The Flowtriq agent runs on every server you want to protect — game servers, DNS infrastructure, web servers, voice servers, database backends. It provides the per-server visibility that Arbor cannot: which specific server is being targeted, what the attack looks like at the packet level, PCAP evidence for forensics, and sub-second alerting to your team's actual communication channels.

In a hybrid deployment, the two products cover each other's blind spots:

• Short attacks that fall below Arbor's detection threshold: A 30-second burst at 100,000 PPS may not generate enough sampled flow data to trigger a Sightline alert, especially if the flow export interval is 5 minutes. Flowtriq detects this within 1-2 seconds.
• Attacks that survive scrubbing: TMS scrubbing is effective but not perfect. Some attack traffic passes through scrubbing centers, especially for sophisticated multi-vector attacks. Flowtriq on the target server sees exactly what traffic is getting through and alerts your team.
• Application-layer attacks: Low-volume, high-impact application-layer attacks (slowloris, HTTP GET floods, targeted resource exhaustion) generate minimal flow anomalies. Per-server detection catches these based on connection patterns and PPS anomalies that flow telemetry misses.
• Post-mitigation forensics: When Arbor mitigates an attack, your team often needs to understand what happened for incident reports, customer communication, or upstream coordination. Flowtriq's PCAP captures and detailed incident records provide the forensic evidence that flow data alone cannot.
• Infrastructure outside your Arbor footprint: Remote edge nodes, cloud instances, colocation servers, or acquired infrastructure that is not yet integrated into your Sightline deployment. Flowtriq covers these immediately with a 5-minute agent install.

The deployment model is straightforward. Arbor continues to operate at the network layer with no changes. Flowtriq agents are installed on individual servers. The two systems operate independently — there is no integration required between them, though both can feed alerts into the same incident management platform (PagerDuty, OpsGenie, etc.) for unified response.

When to Use Each

Keep Arbor (and do not add Flowtriq) when:

• Your DDoS detection needs are entirely at the network level and you do not need per-server visibility.
• Your environment is a transit network where you do not operate the end servers — you are an ISP protecting customer prefixes and do not have agent access to customer machines.
• Your existing Sightline + TMS deployment already meets your detection latency and data depth requirements.
• You have built custom integrations that extract per-server-level data from your Arbor flow records (possible with careful managed object configuration, though labor-intensive).

Add Flowtriq alongside Arbor when:

• You operate servers (game servers, DNS, web, voice) and need to know which specific server is being attacked, not just which prefix.
• Your team needs sub-minute detection latency. Arbor's flow-interval-based detection is too slow for your SLA requirements.
• You need PCAP evidence for incident response, upstream abuse reports, or customer communication.
• Your NOC team uses Slack, Discord, or PagerDuty and needs alerts in those channels without building custom middleware on top of Arbor's SNMP/syslog output.
• You have infrastructure outside your Arbor footprint (cloud, remote edge, colocation) that needs detection coverage.
• You want attack classification with confidence scoring without manual flow analysis.

Use Flowtriq without Arbor when:

• You do not have (and cannot justify) the CAPEX for an Arbor deployment. Flowtriq provides immediate DDoS detection value at $9.99/node/month with no infrastructure investment.
• You are a hosting company, game server operator, or SaaS provider that needs per-server detection and does not require network-wide flow analytics.
• Your infrastructure is primarily cloud-based or collocated and you do not have flow-exporting network devices you control.
• You need to deploy detection quickly. Flowtriq's agent installs in under 5 minutes. Arbor deployments are measured in weeks or months.

Addressing the "We Already Have Arbor" Objection

We hear this frequently, and our response is genuine: great. Arbor is a strong product and you have already invested in network-level visibility. The question is not whether to replace Arbor. It is whether your current setup gives you everything you need at the server level.

Ask your team these questions:

• When a DDoS attack hits, how quickly do you know which specific server is being targeted? If the answer is "we check the managed objects in Sightline and then correlate with our IPAM," you have a per-server visibility gap.
• When a customer reports they were attacked, can you provide them with a PCAP and a per-second PPS timeline? If the answer is "we can show them the flow data," they are going to ask for packet-level evidence.
• How quickly does your team get alerted? If your Sightline flow export interval is 5 minutes and your alert pipeline adds another 2-3 minutes, your team may be learning about attacks 7-8 minutes after they start. For a game server operator, that is 7-8 minutes of player disconnections and support tickets.
• Do you have infrastructure outside your Arbor footprint? Edge servers at remote POPs, cloud instances, colocation servers — are those blind spots?

If any of those answers reveal gaps, Flowtriq fills them. At $9.99/node/month, the cost of adding per-server detection alongside your existing Arbor deployment is trivial compared to what you have already invested in Sightline and TMS. And the two products do not conflict — they operate at different layers and provide different data.

The Honest Summary

Arbor Sightline is the industry standard for network-wide flow-based DDoS detection and mitigation orchestration. It is the right tool for ISPs, large enterprises, and any organization that needs macro-level network visibility and automated scrubbing. Its ATLAS threat intelligence feed is unique. Its integration with TMS scrubbing appliances is mature. If you are a Tier 2 ISP processing 200 Gbps of transit traffic, there is no substitute for Sightline.

Flowtriq is a per-server detection agent that provides the granularity, speed, and forensic data that flow-based systems architecturally cannot. It detects attacks in seconds instead of minutes, identifies the exact target server instead of the target prefix, captures PCAP automatically, and alerts your team through the channels they actually use. It costs a fraction of what Arbor costs and deploys in minutes instead of months.

They are complementary. The strongest DDoS detection posture uses network-level visibility (Arbor or equivalent) for the macro picture and automated mitigation, plus per-server detection (Flowtriq) for the micro picture, forensic evidence, and rapid alerting. If you can only afford one, the decision depends on your role: if you are an ISP protecting customer prefixes, you need Arbor. If you are an operator protecting your own servers, Flowtriq gives you more actionable data at a lower cost.

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