SGS-6340 Series User Manual

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65.4 DNS Troubleshooting
In configuring and using DNS, the DNS may fail due to reasons such as physical connection failure or wrong
configurations. The user should ensure the following:
 First make sure good condition of the TACACS+ server physical connection;
 Second all interface and link protocols are in the UP state (use “show interface” command);
 Then please make sure that the DNS dynamic lookup function is enabled (use the “ip domain-lookup”
command) before enabling the DNS CLIENT function. To use DNS SERVER function, please enable it
(use the “ip dns server” command);
 Finally ensure configured DNS server address (use “dns-server” command), and the switch can ping
DNS server;
 If the DNS problems remain unsolved, please use debug DNS all and other debugging command and
copy the DEBUG message within 3 minutes, send the recorded message to the technical service center
of our company.