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Wireshark Revealed: Essential Skills for IT Professionals by Charit Mishra, Yoram Orzach, James H Baxter

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Troubleshooting connectivity issues

Single user or small group connectivity issues can be resolved by confirming that the networking functions required for a user workstation to access local and remote network resources are functioning properly. The basic requirements or items to confirm include:

  • Enabling the correct network interface(s) (workstation configuration)
  • Confirming layer 1 (physical) connectivity
  • Obtaining an IP address, subnet mask, and default gateway for each interface (DHCP)
  • Obtaining the MAC address of the default gateway or other local network services (ARP)
  • Obtaining the IP address of a network service (DNS)
  • Connecting to a network service (TCP handshake or UDP response)

We'll briefly discuss each of these in order; while the first ...

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