Qtech QSW-8200-28T-AC-DC [14/20] Dns lookup

User Manual

Chapter 3. Commands for DNSv4/v6 14

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 Parameter: <ip-address> is the IP address, in dotted decimal notation, <ipv6-address>

is the IPv6 address, <value> is the priority of DNS server, range between 0~255, 0 by

default.

 Command Mode: Global Mode.

 Default: Not configuration.

 Usage Guide: This command is used for configure or delete DNS server, when need to

enable dynamic domain name mapping, the switch will sending a domain name search

request packet to configured DNS server, the DNS server can be configured no more

than 6. The priority is the optional parameter, if priority is configured, the DNS server

must be organized according to the order of priority, from high to low. That is the

switch sending domain name search request to the server which have the biggest

priority, so some DNS server with quick search speed and used frequently can be

configured to highest priority. If priority is not configured, to search DNS server must

according to the configuration order. When the switch serves as a DNS SERVER, the

queries to the DNS SERVER won’t follow the above privilege rule; instead, the requests

will be sent to all configured servers at the same time

 Example: To configure the priority of DNS server as 200, the server’s address is

10.1.120.241.

 Switch(config)# dns-server 10.1.120.241 priority 200

3.4 dns lookup

 Command: dns lookup {ipv4 | ipv6} <hostname>

 Function: To enable DNS dynamic domain name resolution.

 Parameter: {ipv4 | ipv6} means the IPv4 or IPv6 address look up, <hostname> is the

resolute dynamic host name, less than 256 characters.

 Command Mode: Global Mode.

 Default: Disabled.

 Usage Guide: This command is used to look up correspond address based on entered

client name, it can look up both IPv4 and IPv6 address. This command only used for

domain name mapping, it have no other application function. When command is

running, interrupt is forbidding. If configured many servers and domain name suffix,

longer time will be required for domain name mapping.

 Example: To look up the IPv4 address of www.sina.com.

 Switch(config)# dns lookup ipv4 www.sina.com

3.5 show dns name-server

 Command: show dns name-server

 Function: To display the information of configured DNS server.

 Parameter: None.

 Command Mode: Admin and Configuration Mode.

 Example:

 Switch# show dns name-server