Question

ipconfig \flushdns不管用啊？

Error: unrecongnized or incomplete command line.

USAGE:
ipconfig [/? | /all | /renew [adapter] | /release [adapter] |
/flushdns | /displaydns | /registerdns |
/showclassid adapter |
/setclassid adapter [classid] ]

where
adapter Connection name
(wildcard characters * and ? allowed, see examples)

Options:
/? Display this help message
/all Display full configuration information.
/release Release the IP address for the specified adapter.
/renew Renew the IP address for the specified adapter.
/flushdns Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names
/displaydns Display the contents of the DNS Resolver Cache.
/showclassid Displays all the dhcp class IDs allowed for adapter.
/setclassid Modifies the dhcp class id.

The default is to display only the IP address, subnet mask and
default gateway for each adapter bound to TCP/IP.

For Release and Renew, if no adapter name is specified, then the IP address
leases for all adapters bound to TCP/IP will be released or renewed.

For Setclassid, if no ClassId is specified, then the ClassId is removed.

Examples:
> ipconfig ... Show information.
> ipconfig /all ... Show detailed information
> ipconfig /renew ... renew all adapters
> ipconfig /renew EL* ... renew any connection that has its
name starting with EL
> ipconfig /release *Con* ... release all matching connections,
eg. "Local Area Connection 1" or
"Local Area Connection 2"

Answer 1

如果计算机上没有运行 DNS Client 服务，则会发生此问题。
要解决此问题，请按照下列步骤操作：
1.单击“开始”，单击“运行”，键入 services.msc，然后单击“确定”。
2.在服务列表中，单击“DNS Client”。
确保“状态”列显示的是“已启动”并且“启动类型”列显示的是“自动”。
3.如果“DNS Client”服务未设置为“已启动”或者其“启动类型”未设置为“自动”，请执行以下步骤：
a.右键单击“DNS Client”，然后单击“属性”。
b.在“DNS Client 的属性”对话框中，单击“常规”选项卡，然后单击“启动类型”列表中的“自动”。
c.单击“启动”，单击“应用”，然后单击“确定”。