B-1: Tcp/Ip Setting Problems - SMC Networks EliteConnect SMCWHSG44-G User Manual

B-1: TCP/IP Setting Problems

Fig. 113. Communication Stages for A Client to
For a client computer to communicate with a correspondent host on the
Internet by the host's domain name (e.g. http://www.smc.com), it first sends
a DNS request to a DNS server on the Internet. The DNS request travels first
to the SMCWHSG44-G, then the SMCWHSG44-G relays this request to the
default gateway of the SMCWHSG44-G through a modem. Finally, this
request is forwarded by the default gateway to the DNS server on the
Internet. The DNS reply issued by the DNS server is transmitted back to the
client computer following 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 ad-dress.
As illustrated in Fig. 113, the communication path could be broken at some of
the stages. The OS-provided network diagnostic tool, ping.exe, can be
employed to find out TCP/IP-related communication 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:
• The wireless client cannot pass Web redirection-based authentication.
• Verify whether the user name and password are correct?
• Check the user credential information stored on the RADIUS server
or locally on the SMCWHS44-G.
• Is the RADIUS server correctly set up?
• Check whether the password for the wireless client is stored using
reversible encryption on the RADIUS server.
Reach its Correspondent Host.
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