QTECH QSW-3400 Инструкция по настройке - Manual (Page 450)

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
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.