OSI Troubleshooting
Troubleshooting layers

Figure shows one approach to troubleshooting at the different OSI layers. There should be an orderly process based on the networking standards that are used.

The following list contains some of the most common errors :

Physical Layer Troubleshooting Issues

  • Power issues
  • Antenna cabling
  • Frequency 2.4 Ghz
  • Check Ethernet settings
  • 802.11a,b,g
  • Interference
  • Amplifiers
  • Grounding
  • Channel number matching
  • Distance versus speed
  • Power safe
  • Transport power
  • Antenna mode
  • Radio role
  • Boot versus repeater
  • During initial setup
  • Ethernet interface
  • Be active
  • Make sure radio is enabled

Data Layer Troubleshooting Issues

  • NDIS drivers
  • SSIDs
  • Adhoc versus infrastructure
  • WEP keys enabled
  • OPEN/shared/EAP authentication
  • Filters
  • Short radio header/world mode
  • VLANs
  • LEAP username/password
  • STP
  • Is hotstandby enabled?
  • Blink Access Point LEDs
  • Reset/restore

Network Layer Troubleshooting Issues

  • Default
  • Filters
  • IP Address and subnet mask
  • VPN issues
  • NAT