Using the Ipconfig Diagnostic Utility for Network Connections.


The following commands are run from Command Prompt to determin or rule out/in network/internet issues.

Each command starts with ipconfig.

Each command would be written:

Example: ipconfig /all (ipconfig space /all.


The most common commands we use are as follows:

ipconfig Show information

ipconfig /all Show detailed information

ipconfig /renew Renew all adapters

ipconfig /renew EL* Renew any connection whose name starts EL

ipconfig /release *Con* Release all matching connections.Example: Local Area Connection 1 or Local Area Connection2


Note: That the /Release and /Renew options can be used only if the system is configured with DHCP.

/? Displays this help message

/all Displays full configuration information

/release Releases the IP address for the specified adapter

/renew Renews the IP address for the specified adapter

/flushdns Purges the DNS Resolver cache

/registerdns Refreshes all DHCP leases and reregisters DNS names

/displaydns Displays the contents of the DNS Resolver Cache

/showclassid Displays all the DHCP ClassIds allowed for the specified adapter

/setclassid Modifies the DHCP ClassId


Notes:

The adapter connection name can use wildcard characters (* and ?).

The default (with no parameters specified) is to display only the IP address, subnet mask, and default gateway for each adapter that is bound to TCP/IP.

For /all, Ipconfig displays all of the current TCP/IP configuration values, including the IP address, subnet mask, default gateway, and Windows Internet Naming Service (WINS) and DNS configuration.

For /release and /renew, if no adapter name is specified, the IP address leases for all adapters that are bound to TCP/IP are released or renewed.

For /setclassid, if no ClassId is specified, the ClassId is removed.

__________________