For a wireless client computer to communicate with a correspondent host on the Internet by the host’s domain name (e.g. http://www.wi-fi.com), it first sends a DNS request to a DNS server on the Internet.The DNS request travels first to the AP, then the AP relays this request to the default gate- way of the client computer. Finally, this request is forwarded by the gateway to the DNS server on the Internet.The DNS reply issued by the DNS server is transmitted back to the client computer fol- lowing a reverse path.When the client computer receives the DNS reply, it knows the IP address of the correspondent host and sends further packets to this IP address.
As illustrated in Fig. 55, the communication path could be broken at some of the stages.The OS-pro- vided network diagnostic tool, ping. exe, can be employed to find out TCP/IP-related communica- tion problems.
NOTE: If two or more NICs are installed and operating on a client computer,TCP/IP may not work properly due to incorrect entries in the routing table. Use the OS-provided command-line network tool, route.exe, to add or delete entries from the routing table. Or, use Windows-provided Device Manager to disable unnecessary NICs.
Solve the following problems in order:
•My SMC2582W-B does not respond to ping from the client computer.
•Are two or more NICs installed on the client computer?
•Use the OS-provided command-line network tool, route.exe, to modify the contents of the routing table.
•Use Windows-provided Device Manager to disable unnecessary NICs.
•Is the underlying link (Ethernet or IEEE 802.11b) established?
•Make sure the Ethernet link is OK.
•Make sure the wireless settings of the wireless client computer and of the SMC2582W-B match.
•Are the IP address of the client computer and the IP address of the SMC2582W-B in the same IP subnet?
•Use WinIPCfg.exe or IPConfig.exe to see the current IP address of the client computer. Make sure the IP address of the client computer and the IP address of the SMC2582W-B are in the same IP subnet.
•TIP: If you forget the current IP address of the SMC2582W-B, use Wireless Router/AP Browser to get the information (see Appendix B-3).
•The default gateway of the client computer does not respond to ping from the client computer.
