Qtech QSW-8200-28T-AC-DC [13/20] Chapter 3 commands for dnsv4 v6

User Manual

Chapter 3. Commands for DNSv4/v6 13

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Chapter 3 COMMANDS FOR DNSV4/V6

3.1 clear dynamic-host

 Command: clear dynamic-host {<ip-address> | <ipv6-address> | all}

 Function: To delete the domain entry of specified address or all address in dynamic

cache.

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

is the IPv6 address; all is to delete the domain entry of all address in dynamic cache.

 Command Mode: Admin Mode.

 Default: Disabled.

 Usage Guide: This command is used to manually delete the domain name and address

entry in dynamic cache, this command is much useful when domain name have lived

long time in cache.

 Example: To delete the address of 202.108.22.5 of domain entry.

 Switch# clear dynamic-host 202.108.22.5

3.2 debug dns

 Command: debug dns {all | packet [send | recv] | events | relay}

 no debug dns {all | packet [send | recv] | events | relay}

 Function: To display the application debug information of DNS domain name

resolution, the no form of this command disables the debug display.

 Parameter: None.

 Command Mode: Admin Mode.

 Example:

 Switch# debug dns all

 Switch# ping host www.sina.com.cn

 %Jan 01 00:03:13 2006 domain name www.sina.com.cn is to be parsed!

 %Jan 01 00:03:13 2006 Dns query type is A!

 %Jan 01 00:03:13 2006 Connect dns server 10.1.120.241 ......

 ping www.sina.com.cn [202.108.33.32]

 Type ^c to abort.

 Sending 5 56-byte ICMP Echos to 202.108.33.32, timeout is 2 seconds.

 %Jan 01 00:03:15 2006 Host:www.sina.com.cn Address:202.108.33.32

 .....

 Success rate is 0 percent (0/5), round-trip min/avg/max = 0/0/0 ms

3.3 dns-server

 Command: dns-server {<ip-address>|<ipv6-address>} [priority <value>]

 no dns-server {<ip-address>|<ipv6-address>}

 Function: To configure/delete DNS server.