Dns Troubleshooting - Planet XGS3-42000R User Manual

Switch configuration for DNS CLIE NT:
XGS 3-42000R(config)# ip domain-look up
XGS 3-42000R(config)# dns-server 219.240.250.101
XGS 3-42000R(config)# dns-server 2001::1
XGS 3-42000R#ping host www.sina.com.cn
XGS 3-42000R#traceroute host www.sina.com.cn
XGS 3-42000R#telnet host www.sina.com.cn
Switch configuration for DNS SERVER:
XGS 3-42000R(config)# ip domain-look up
XGS 3-42000R(config)# dns-server 219.240.250.101
XGS 3-42000R(config)# dns-server 2001::1
XGS 3-42000R(config)# ip dns server

65.4 DNS Troubleshooting

In configuring and using DNS, the DNS may fail due to reas ons such as physical connection failure or wrong
configurations. The user should ens ure the following:

First make sure good condition of the TACACS+ server physical connection;

Second all int erface 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 CLIE NT 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 cent er of our company.
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