ipconfig

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

ipconfig
Ipconfig win xp.png
Screenshot of ipconfig /all output in Windows XP
Developer(s)Microsoft, ReactOS Contributors, Apple Inc.
Operating systemMicrosoft Windows, ReactOS, macOS
PlatformCross-platform
TypeCommand
LicenseMicrosoft Windows: Proprietary commercial software
ReactOS: GNU General Public License

ipconfig (standing for "Internet Protocol configuration") is a console application program of some computer operating systems that displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) settings.[1]

Implementations[edit]

The command is available in Microsoft Windows, ReactOS, and in Apple macOS. The ReactOS version was developed by Ged Murphy and is licensed under the GPL.[2]

Microsoft Windows, ReactOS[edit]

The ipconfig command supports the command-line switch /all. This results in more detailed information than ipconfig alone.

An important additional feature of ipconfig is to force refreshing of the DHCP IP address of the host computer to request a different IP address. This is done using two commands in sequence. First, ipconfig /release is executed to force the client to immediately give up its lease by sending the server a DHCP release notification which updates the server's status information and marks the old client's IP address as "available". Then, the command ipconfig /renew is executed to request a new IP address.[3][4] Where a computer is connected to a cable or DSL modem, it may have to be plugged directly into the modem network port to bypass the router, before using ipconfig /release and turning off the power for a period of time, to ensure that the old IP address is taken by another computer.[5]

The /flushdns parameter can be used to clear the Domain Name System (DNS) cache to ensure future requests use fresh DNS information by forcing hostnames to be resolved again from scratch.[6]

Apple macOS[edit]

ipconfig in Mac OS X serves as a wrapper to the IPConfiguration agent, and can be used to control the Bootstrap Protocol and DHCP client from the command-line interface.[7] Like most Unix-based operating systems, Mac OS X also uses ifconfig for more direct control over network interfaces, such as configuring static IP addresses. The Ifconfig command in Linux has been replaced by the IP command

See also[edit]

References[edit]

  1. ^ "ipconfig". Microsoft Docs. 16 October 2017. Retrieved 25 August 2020.
  2. ^ https://github.com/reactos/reactos/blob/master/base/applications/network/ipconfig/ipconfig.c
  3. ^ Release and Renew Your IP Address
  4. ^ Windows – Displaying, Releasing and Renewing a DHCP Lease
  5. ^ whatsmyipaddress: How to change your IP address
  6. ^ Windows 8.1 PCs Connect to the Network but not the Internet
  7. ^ OS X developer manual

Further reading[edit]

External links[edit]