Fluke Network Tester user manual Network Problems, Health Problems

Page 57

 

Common Problems

6

 

Problems NetTool Detects

Network Problems

• Problem: Excessive utilization seen (also collisions).

This section lists all of the network problems. Keep in mind

Explanation: Excessive utilization/collisions is

 

that this is not an exhaustive list of troubleshooting steps.

 

defined as a collision rate of greater than 5 percent or

If you know what you need, the network administrator for

a utilization rate of greater than 70 percent.

 

the network you are troubleshooting can provide you with

 

 

 

a lot of information to correct these problems.

Remedy: If this problem exists everywhere on the

 

 

 

Health Problems

network, it is most likely caused by excessive traffic. If

it is isolated to a single PC, you can suspect cabling.

• Problem: Short Frames received (also jabber/FCS).

For collisions, suspect excessive traffic. Reduce traffic

 

Explanation: A short frame is a frame that is smaller

on the network. Check cabling. Change the NIC card

than the minimum legal size (less than 64 bytes after

or switch/hub port.

 

the preamble) with a good frame check sequence.

For utilization, reduce the number of stations in the

 

Jabber is defined as frames longer than the maximum

 

legal size (greater than 1518 bytes). Frame Check

collision domain. Install a switch. Use a tool like the

Sequence (FCS) Bad means that the header

OptiView™ Network Analyzer, Etherscope™ Network

information is probably correct, but the checksum

Assistant, or OptiView™ Console to determine the top

calculated by the receiving station does not match the

contributors to further segment this network.

 

checksum appended to the end of the frame.

Remedy: Check the NIC card or NIC driver file. This problem can also be caused by cabling or grounding problems.

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Contents NetTool Limited Warranty and Limitation of Liability Table of Contents NetTool Iii Common Problems Appendices NetTool List of Tables Viii List of Figures NetTool Introduction Using This Manual What is NetTool?Care and Maintenance NetTool FeaturesPackage Contents Service and Adjustment Optional AccessoriesRegistering NetTool PC/NetTool Link Utility Programs Contacting Fluke NetworksNetTool Blaster Getting Acquainted Installing and Running the Link UtilitiesNetTool Toolkit Turning on NetToolLink/Collision/Error LED Understanding the LEDsUtilization LED NetTool Menus IconsMain Menu Navigation Keys ScrollingMaximizing Battery Life Power SupplyInstalling the Batteries Using the AC AdapterUpdating NetTool’s Software Setting Up and Connecting NetTool Configuring NetToolIntroduction Settings Menu Changing the System SettingsManually Assigning NetTool an IP Address Identifying Unwanted ProtocolsSelecting a Language for the Display Screens Creating a List of IP Addresses to PingObtaining Information about Your NetTool Connecting NetTool Connecting a Patch CableSingle-Ended Connection Single-Ended Connection into a Wall Jack Inline Connection between a PC Network Inline ConnectionSerial Port Connection Recommended speed setting for the serial port isRunning AutoTest AutoTestWiremap Cable Test ResultsCable Length, Opens, Shorts, and Splits Network Drop Single-Ended AutoTest ResultsNetwork Device Services NetTool Discovers DeviceInline between a Device and the Network Inline AutoTest ResultsLink and Polarity Level Indicator Definition Inline between a PoE Powered Device and the Network NetTool Verifying a Device’s Configuration Troubleshooting a Network DeviceViewing Link Status Information Link Configuration DetailsHealth Details Checking Frames for ErrorsSelect Protocols Screen Tracking ProtocolsAddresses Used Screen Obtaining a Device’s IP Address InformationVlan Information Identifying Network ResourcesNetTool Finding Out About Your Network Troubleshooting NetworksSegment ID Screen Identifying the Network TypeIdentifying Key Devices Troubleshooting NetworksPing Pinging a Single DeviceAssigning an IP Address to NetTool Ping Pinging Multiple DevicesPing Results Screen Displaying the Problem Log Common ProblemsProblem Log Understanding the Problem Log DisplayProblems NetTool Detects Link Connectivity ProblemsThings to Consider Problem Transmit pair open Health Problems Network ProblemsNetWare Problem Ethernet frame-type mismatchesTCP/IP Host ConfigurationProblem Wins resolution failed Name ResolutionNetBIOS Web Problem PC involved in MB electionsPrinter Problem Unable to connect to POP3 serverUnwanted protocols when enabled Verifying Voice over IP Service Viewing Vlan and CDP Information Viewing PoE Voltage and Pair InformationVoIP Log VoIP LogRTP drop Viewing Call Quality MeasurementsBefore You Begin Creating and Managing ReportsReporter Menu Creating a ReportDeleting or Overwriting a Report NetTool Appendix Title AppendicesPage General Specifications SpecificationsEnvironmental Requirements Temperature ApprovalsSample VoIP Call Logs Dhcp ACK Typical Cisco Skinny Sccp Phone BootupAppendices Start Media Xmit Typical Cisco Skinny Sccp Call LogSample VoIP Call Logs B Typical Cisco Skinny Sccp Call Log Typical SIP Phone Bootup Log Typical SIP Phone Bootup Log Typical SIP Call Log Typical SIP Call Log 10BASE2 Glossary802.3 Access MethodAnomaly 802.2Bridge Switch ARP Address Resolution ProtocolCharacteristic impedance AttenuationCollision ClientCrossed Pair CrosstalkEIA568 Destination AddressEncapsulation EthernetHalf-Duplex Full-DuplexIcmp Internet Control and Message Protocol IP Internet ProtocolJitter JabberLAN Local Area Network Late CollisionPing NIC Network Interface CardNode Number NVP Nominal Velocity of PropagationRemote Collision RJ-45 ConnectorRepeater Router or GatewaySignal/Noise Ratio SAP Service Advertising ProtocolRtcp Real-time Transport Control Protocol RuntsSnmp Simple Network Management Protocol Snap Subnetwork Access ProtocolSource Address Split PairUptime TopologyTransport TransceiverIndex NetTool Index NetTool
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