IPCONFIG

Configure IP.

syntax

  IPCONFIG /all         Display full configuration information.

  IPCONFIG /release [adapter]
                        Release the IP address for the specified adapter.

  IPCONFIG /renew [adapter]
                        Renew the IP address for the specified adapter.

  IPCONFIG /flushdns    Purge the DNS Resolver cache. ##

  IPCONFIG /registerdns Refresh all DHCP leases and re-register DNS names. ##

  IPCONFIG /displaydns  Display the contents of the DNS Resolver Cache. ##

  IPCONFIG /showclassid adapter
                        Display all the DHCP class IDs allowed for adapter. ##

  IPCONFIG /setclassid  adapter [classid]
                        Modify the dhcp class id. ## 

## = New option in Win 2K/XP

If the Adapter name contains spaces, use quotes: "Adapter Name"
wildcard characters * and ? allowed, see the examples below

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"

    > ipconfig /setclassid "Local Area Connection" TEST 
                                 ... set the DHCP class ID for the 
                                     named adapter to = TEST

"Life is a grand adventure - or it is nothing." - Helen Keller

Related Commands:

BROWSTAT - Get domain, browser and PDC info
NETSTAT - Display networking statistics (TCP/IP)
NETSH - Configure interfaces, routing protocols, filters, routes, RRAS
PATHPING - IP trace utility
PING - Test a network connection

Q192064 - Locate multiple preferred logon servers
Q813878 - How to block specific network protocols and ports.
Q313190 - Use IPSec IP Filter Lists
The Inq/Jon Honeyball - Routing to harden machines against attack
NTFAQ - How to disable automatic private IP addressing (2K and XP)

Equivalent Linux BASH commands:

ping - Test a network connection
trace - Find the IP address of a remote host.