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Reverse Path Visibility with Agent-to-Agent Tests
This document discusses reverse path visibility using agent-to-agent tests in ThousandEyes. It describes how agent-to-agent tests provide bidirectional path visibility across internal and external networks to accurately monitor the forward and reverse paths. This gives more precise diagnostic data to isolate network faults. It also explains how enabling NAT traversal allows agent-to-agent tests to work across NAT devices without requiring inbound port forwarding rules.
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Reverse Path Visibility with Agent-to-Agent Tests
- 1. Reverse Path Visibility withAgent-to-Agent Tests Archana K7, Product Marketing Manager
- 2. 1 About ThousandEyes ThousandEyes deliversvisibility into every network your organization relies on. Founded by network experts; strong investor backing Relied on for critical operations by leading enterprises Recognized as an innovative new approach 27 Fortune 500 5 top 5 SaaS Companies 4 top 6 US Banks
- 3. 2 View Across Internaland External Networks Hosting / SaaS Provider 1 Internal network – Monitor WAN, Datacenter Internet 3 Monitor any service, application from global vantage points 2 Monitor IaaS, SaaS service hosted in the cloud Cloud AgentEnterprise Agents Branch Data Center
- 4. 3 • Agent-to-Server – TestTarget is an application or service endpoint • Agent-to-Agent – Monitoring location and test target are both agents – Cloud–Enterprise or Enterprise–Enterprise Network Tests • Visibility and insight into the network used to connect between each testing location and target • Usually bundled with other types of tests - HTTP, Page Load What Types When • Hop-by-hop network path and node level data • Packet loss, Jitter, Latency, Bandwidth
- 5. 4 Reverse Path • Ato B B to A • Packet’s do not flow symmetrically over a network • Peering relations between ISP’s • Load-balancing algorithms • Multiple ECMP paths • Traceroute based monitoring techniques focus ONLY on forward path
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- 7. 6 Accurate real-time representationof forward & reverse paths providing visibility into internal and external networks More precise diagnostic data to help isolate faults with directional and hop by hop granularity significantly reducing MTTT Unified visualization to simplify deployment workflows and management Agent-to-Agent Tests
- 8. 7 Bidirectional View AcrossInternal and External Networks Hosting / SaaS Provider 1 Internal network – Monitor WAN, Datacenter Internet 3 Monitor any service, application from global vantage points 2 Monitor IaaS, SaaS service hosted in the cloud Cloud AgentEnterprise Agents Branch Data Center 4 Discover Forward & Reverse paths. Outbound ISP performance
- 9. 8 • Internal WANMonitoring – Discover ECMP paths – Precise metrics in both directions • Performance of outbound/egress path from branch office or datacenter – Compare ISP performance across forward and reverse path • Forward and Reverse Path MTU Agent-to-Agent Use Cases
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- 11. 10 NAT Basics Enterprise Agent Web ServerNAT 10.0.0.2:1025<-> 49.1.4.23:3827 10.0.0.2:1025 -> 1.2.3.4:80 49.1.4.23:3827 -> 1.2.3.4:80 NAT Table 1.2.3.4:80 -> 49.1.4.23:38271.2.3.4:80 -> 10.0.0.2:1025
- 12. 11 • NAT configurationsallow communication originating from the internal network • Externally originating communication normally require forwarding rules on the NAT NAT Basics Enterprise Agent NAT 1.2.3.4:80 -> 49.1.4.23.3:827 Cloud Agent
- 13. 12 • Agent-to-Agent testsrequire NAT device to allow externally generated communication – Requires security department to open a port – Increases configuration rules • NAT Traversal facilitates communication between endpoints across NAT devices w/o the need for inbound rules NAT Traversal
- 14. 13 How NAT Traversalworks
- 15. 14 qHow to configureAgent-to-Agent tests qLive Demo qHow to configure NAT traversal Demo
- 16. 15 Step1: Add anAgent-to-Agent Test Agent-to-Agent tests is a part of Network tests Select a target agent Select from available agents as the test source Select the direction for the test
- 17. 16 Step 2: ConfigureAlerts Add End-to-End alerts for Agent- to-Agent tests Specify the direction of the tests for the alerts Map the alerts to the test
- 18. 17 Step 3: Explorethe Network views Target service Network metrics are calculated per direction
- 19. 18 Step 4: ExplorePath Visualization showing forward and reverse paths Loss only see in the reverse path
- 20. 19 How to enableNAT Traversal Flag Enable NAT Traversal Flag for Enterprise agents under “Advanced Settings”
- 21. 20 See what you’remissing. Watch the webinar https://www.thousandeyes.com/resources/reverse-path-visibility-webinar