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Network Troubleshooting
www.nws.edu
Justin Trieger | Technical Director for Distance Education
Network Troubleshooting
www.nws.edu
Justin Trieger | Technical Director for Distance Education
Network Troubleshooting Justin Trieger | Technical Director for - - PowerPoint PPT Presentation
Network Troubleshooting Justin Trieger | Technical Director for - - PowerPoint PPT Presentation
Network Troubleshooting Justin Trieger | Technical Director for Distance Education www.nws.edu Network Troubleshooting Justin Trieger | Technical Director for Distance Education www.nws.edu Identifying the Problem Packet Loss, Computer
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Identifying the Problem
Do you see it? Can you hear it? Do you feel it?
Packet Loss, Computer Resources, Format Conflict Packet Loss, Jitter, Distortion Jitter, Latency, Audio/Video Issues
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Making Assumptions
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Start at the Beginning!
Confirm network traffic is taking the path it should.
R&E Network Commodity Internet
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Start at the Beginning!
Traceroute is a command line application that reveals Network routes from IP to IP .
On Windows: tracert 192.1.1.220 On Mac/Linux: traceroute 192.1.1.200
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Start at the Beginning!
R&E Network Commodity Internet R&E Network
Symmetry is not only beautiful, it makes for clean transmissions
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Local Host
- Is the device operating with CPU/RAM headroom?
- Is the network connection and configuration correct?
- Are video and audio signals ingested without issue?
- If a loopback test can be performed (127.0.0.1), is the signal
received without error?
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The LAN
Step One: Establish a clean connection host to host
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The LAN
Step Two: Incrementally move through the network topology switch by switch
Host A (Host B) Switch One
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The LAN
Step Two: Incrementally move through the network topology switch by switch
Host A Switch One Switch Two Host B
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The LAN
Step Two: Incrementally move through the network topology switch by switch
Host A Switch One Switch Two Switch Three (Host B)
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The LAN
Step Two: Incrementally move through the network topology switch by switch
Host A Switch One Switch Two Switch Three (Host B) Router
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The LAN
Step Two: Incrementally move through the network topology switch by switch
Host A (Host B) (Host B) Switch One Switch Two Switch Three (Host B) Router
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Now What?!
- Make sure the far-end does the same LAN testing
- Compile all your findings including traceroutes, throughput testing,
application errors etc. and send this to your respective R&E network providers
- Perhaps even better, invite them for a happy hour beer first
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These Tools Are Your Friends
Ping: A simple command-line application that allows you to test network connectivity between devices by IP . (Beware: Ping uses ICMP packets which may be blocked by a firewall or other security measure) Traceroute: Traces network pathways between IP addresses. Routes should ideally be symmetrical. iPerf: Bandwidth throughput testing application that runs on all platforms. Based on a client/server relationship.
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perfSONAR
perfSONAR is a network measurement toolkit designed to provide federated coverage of paths, and help to establish end-to-end usage expectations.
- Runs on a light version of Linux
- Is configured to run regular tests against other perfSONAR
nodes to verify network connectivity
- Uses accuracy instead of load testing to verify network links
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http://stats.es.net/ ServicesDirectory/
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Contact Information
Justin Trieger | Justin.Trieger@nws.edu (305) 428-6756