Deploying Radware DefensePro for DDoS Protection in Hybrid Networks

Hybrid networks expose applications through several paths: internet-facing data centers, public cloud workloads, remote access services, and private links between sites. A denial-of-service event can target any of these paths, and a mitigation design that protects only the primary data center may leave cloud applications or backup circuits vulnerable.

Radware DefensePro provides dedicated traffic analysis and attack mitigation close to the protected network. In a hybrid deployment, it commonly works alongside upstream providers, cloud scrubbing services, routers, firewalls, and load balancers. The objective is to identify malicious volume quickly while preserving legitimate sessions and keeping normal traffic on the shortest practical path.

A successful implementation depends less on appliance installation than on traffic engineering. Before configuring policies, document public prefixes, routing ownership, application dependencies, return paths, management access, and the point at which traffic should be diverted during an attack.

Define The Protection Boundary

Start with an inventory of internet-facing IP ranges, autonomous system numbers, DNS records, NAT pools, VPN endpoints, and published application services. Group assets by business function and risk rather than treating every address identically. A public web tier may need a different detection profile from a DNS service, mail gateway, or API platform.

Mark which workloads reside on-premises, in a colocation facility, or in a public cloud. For cloud-hosted prefixes, confirm whether the provider permits the intended routing model and whether the cloud edge can accept GRE, BGP, or another supported handoff. DefensePro can protect traffic entering a network, but it cannot compensate for an undocumented route or an asymmetric return path.

Define measurable success criteria before testing. Useful targets include attack detection time, mitigation activation time, maximum acceptable latency, clean-traffic throughput, and the services that must remain reachable during a saturated transit link. These values become the basis for capacity planning and incident runbooks.

Choose The Traffic Steering Model

DefensePro can be deployed inline, where all traffic passes through the appliance, or out of path, where routing sends selected traffic through it during an attack. Inline mode provides continuous inspection and can respond without a diversion event, but it introduces a device into the production failure domain. Out-of-path designs reduce that risk and are often preferred for large, distributed networks, though they require reliable BGP or policy-based steering.

A common hybrid pattern uses BGP advertisements to move a victim prefix toward a mitigation location. The clean traffic then returns through the protected data center or cloud edge using GRE tunnels, routed transit, or a provider-defined handoff. Keep the routing design symmetric wherever possible; stateful firewalls, NAT, and application delivery controllers can fail when forward and return traffic take unrelated paths.

For geographically distributed environments, establish which site is authoritative for each prefix. Use route filtering, maximum-prefix limits, communities, and controlled local-preference changes to prevent accidental propagation. During an incident, the diversion process should be deterministic rather than dependent on manual changes across several routers.

Design area	Inline deployment	Out-of-path deployment	Hybrid operating note
Normal traffic path	Always through DefensePro	Bypasses the appliance until diverted	Use inline for critical choke points and diversion elsewhere
Detection response	Immediate policy enforcement	Requires routing or service activation	Automate the trigger and rollback
Failure impact	Appliance failure may affect production	Less direct production dependency	Build bypass, HA, or alternate routing
Best fit	Stable, high-value ingress paths	Large prefixes and intermittent attacks	Combine local mitigation with upstream scrubbing
Main validation	Throughput, latency, fail-open behavior	BGP convergence and return routing	Test cloud, data center, and backup paths

Prepare Network And Platform Dependencies

Place DefensePro where it can inspect the traffic without creating an unintended bottleneck. Verify interface speed, packet-per-second capacity, burst behavior, VLAN requirements, MTU, and tunnel overhead. A volumetric attack may exhaust an upstream circuit before packets ever reach the appliance, so local mitigation should be paired with upstream filtering or cloud DDoS scrubbing when transit capacity is limited.

Deploy management access on a restricted network and separate it from data-plane interfaces. Use role-based administration, centralized authentication where supported, time synchronization, secure syslog, SNMP monitoring, and configuration backups. Record software versions and confirm that the selected DefensePro release supports the required routing, tunnel, and integration features.

High availability should be designed around both device failure and path failure. Validate state or configuration synchronization, health monitoring, bypass behavior, and the consequences of losing a peer. A redundant appliance pair does not protect against a failed upstream circuit, a broken BGP session, or an incorrectly advertised prefix.

Configure Detection And Mitigation Policies

Begin with baseline traffic rather than aggressive thresholds. Capture normal rates by protocol, destination, source geography, connection behavior, and application port. DefensePro policies can then distinguish unusual floods from expected peaks such as software releases, backups, marketing campaigns, or scheduled API activity.

Use layered controls for common attack classes, including SYN floods, UDP floods, fragmented packets, malformed traffic, DNS abuse, HTTP request floods, and scans. Rate limits should protect services without silently blocking legitimate clients. Where application context is required, coordinate with the web application firewall, reverse proxy, or load balancer instead of forcing network-layer controls to make application-layer decisions.

Define an escalation path for attacks that exceed local capacity. A typical workflow detects the event locally, alerts the operations team, diverts the affected prefix to a scrubbing service, and returns clean traffic through the approved tunnel or interconnect. Document who authorizes diversion, how long temporary routes remain active, and how operators verify that mitigation is working.

Integrate Monitoring And Automation

Connect DefensePro alerts to the existing monitoring and incident response platform. Track attack status, protected-prefix health, interface utilization, dropped packets, mitigation actions, BGP session state, tunnel availability, and appliance resource consumption. Alert thresholds should distinguish a rising baseline from an active attack to avoid fatigue during normal traffic growth.

Centralize logs with accurate timestamps so analysts can correlate appliance events with router changes, firewall drops, DNS modifications, and application errors. Retain enough detail to support post-incident review while filtering sensitive payload data according to organizational policy.

Automation is useful for repeatable actions such as prefix diversion, ticket creation, notification, and rollback. Keep safeguards in the workflow: validate the prefix, confirm the next hop, check route policy, require an approval for high-impact changes, and automatically expire temporary advertisements. Test automation in a lab or maintenance window before connecting it to production routing.

Test Failover And Recovery

A DDoS protection design is incomplete until it has been exercised. Start with non-disruptive validation: confirm management access, inspect expected traffic, verify route advertisements, and test that clean traffic reaches each application tier. Then test appliance failure, link failure, BGP withdrawal, tunnel loss, and return to the normal route.

Traffic-generation tests should be authorized and carefully bounded. Measure detection time, false positives, CPU and interface utilization, application latency, session survival, and route convergence. Include both volumetric and low-rate application-layer patterns because a network can remain below its bandwidth limit while an expensive application endpoint becomes unavailable.

Write a recovery runbook that includes commands, dashboards, escalation contacts, and rollback criteria. After each exercise, update route maps, thresholds, diagrams, and ownership details. Store the tested configuration in version control where practical, with secrets removed or managed through an approved secret store.

Turn The Design Into An Operating Practice

The following recommendations keep DefensePro effective after the initial deployment:

• Review public prefixes, routing policies, and cloud ingress paths whenever applications or providers change.
• Re-baseline detection thresholds after major traffic growth, seasonal events, or architecture changes.
• Test high-availability, diversion, bypass, and rollback procedures at least twice a year.
• Monitor clean-traffic capacity as well as attack counters so upstream saturation is identified early.
• Keep firmware, signatures, licenses, support contacts, and configuration backups aligned with the production design.

Operational ownership should be explicit. Network teams may manage BGP and transit, security teams may tune mitigation policies, and application teams may validate service behavior. A shared runbook prevents delays when an attack crosses those boundaries.

Use incident reviews to separate detection problems from capacity problems. If an attack was identified promptly but the circuit saturated first, the answer may be upstream scrubbing or additional transit rather than a new local signature. If clean traffic was blocked, policy tuning and application baselines deserve attention.

Build a small lab or maintenance-window simulation around the production topology, then validate one protected path at a time. Document the working route and mitigation sequence in your team’s repository so the next operator can execute it under pressure.