Release & Renew DHCP from Command Line with ipconfig on Mac

Release & Renew DHCP from  Command Line with ipconfig on Mac

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So after a lot of requests from our users here is a guide about Release & Renew DHCP from the Command Line with ipconfig on Mac.

If you need to release and refresh DHCP from the command line on a Mac, the handy ipconfig utility can do it quickly. Keep in mind that for most Mac OS X users, extending a DHCP lease of the Mac system preferences is the best approach because it is easy to use and just as effective, but the Terminal approach has advantages for advanced users and can run ssh and single user mode, making this a valuable knowledge to share.

How to Renew the DHCP lease from the Mac command line

The base syntax to renew DHCP lease from the command line with ipconfig is as follows:

sudo ipconfig set (DEVICEINTERFACE) DHCP

If you know the device interface (en0, en1, en2, etc.), just run that command to release DHCP and then renew it for the particular device. Let’s say it’s en0, which is standard for modern Wi-Fi only Macs.

sudo ipconfig set en0 DHCP

After the command is executed, you can check if DHCP is set correctly by determining DHCP info with the same ipconfig command with ‘getpacket’ like:

ipconfig getpacket en0

Assuming the previous ‘set’ command was successful, getpacket returns the DHCP assigned IP, DNS server, subnet mask, router / gateway and lease time. If the DHCP info is returned blank, the interrogated interface was incorrect or the DHCP lease was not renewed or distributed correctly.

Another crude option would be to run ipconfig for all available device interfaces on the Mac by concatenating the syntax like this:

sudo ipconfig set en0 DHCP && sudo ipconfig set en1 DHCP

However, it is best to set DHCP for the specific interface.

If you don’t know the interface, the first step is to determine the computer’s hardware device interface that is used for the specific network port that you are using. For most modern Macs we are looking for Wi-Fi which is usually on en0, but many Mac users use ethernet, a personal hotspot for the iPhone, a tethered Android phone, or also an external NIC card, each of which can have a different device interface depending on the hardware. You can easily determine the device interface by running networksetup -listallhardwareports as follows:

networksetup -listallhardwareports

Scroll through the output to find the interface for which you want to set up and refresh DHCP. Let’s assume you are looking for “Wi-Fi” which might look like this:

Hardware Port: Wi-Fi Device: en0 Ethernet address: b1: 3f: 22: dd: ab: 19

Next to ‘Device’ you will find the interface, in this case it is “en0”, which is plugged into the aforementioned ipconfig command.

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Release & Renew DHCP from the Command Line with ipconfig on Mac: FAQ

Tutorial Summary: Release & Renew DHCP from the Command Line with ipconfig on Mac

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How this tutorial helping you?

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What is actual time in which this method complete?

The time to complete the Release & Renew DHCP from the Command Line with ipconfig on Mac tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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