Ipconfig

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Forced release & renew

An important additional feature of ipconfig is to allow system admins 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 which is usually a different ip address than the original ip address.[1][2] In the case where your computer is connected to a Cable or DSL modem, you may need to plug directly into the modem network port bypassing your router and issue ipconfig /release followed by turning off your power for a period of time to ensure that your old ip address is taken by another computer.[3]

Mac OS X ipconfig

ipconfig in Mac OS X serves as a wrapper to the IPConfiguration agent, and can be used to control the BootP and DHCP client from the command line interface.[4] 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.

See also

References

  1. ↑ Release and Renew Your IP Address
  2. ↑ Windows - Displaying, Releasing and Renewing a DHCP Lease
  3. ↑ whatsmyipaddress: How to change your IP address
  4. ↑ OS X developer manual

External links

  • Mac OS X
    • ipconfig(8): view and control IP configuration state – Darwin and Mac OS X System Manager's Manual
Windows command-line programs and built-ins
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