Ipconfig renew on linux

How to release an IP address and renew from the commandline?

I am using modern versions of Ubuntu that use network-manager, and I would like release and renew my network settings through the commandline. In the olden days when Ubuntu used the interfaces file, I would simply do: sudo /etc/init.d/networking restart but now that no longer works. I am looking for functionality similar to Windows’ ipconfig /release and ipconfig /renew . How can I release and renew network settings from the commandline interface?

Which version of Ubuntu? Network Manager’s tools have evolved over time. Have a look at manpages.ubuntu.com/manpages/xenial/en/man1/nmcli.1.html

2 Answers 2

To release and renew the IP address it is:

sudo dhclient -r sudo dhclient

Or you can try a one-liner that grabs the default ethernet name from netstat (using -v switch to show verbose):

NIC=$(netstat -r | awk '/default/ '); sudo dhclient -r -v $NIC && sudo dhclient -v $NIC 

From the dhclient manpage:

 -r Release the current lease and stop the running DHCP client as previously recorded in the PID file. When shutdown via this method dhclient-script will be executed with the specific reason for calling the script set. The client normally doesn't release the current lease as this is not required by the DHCP protocol but some cable ISPs require their clients to notify the server if they wish to release an assigned IP address. 

terrance@terrance-ubuntu:~$ NIC=$(netstat -r | awk '/default/ '); sudo dhclient -r -v $NIC && sudo dhclient -v $NIC [sudo] password for terrance: Internet Systems Consortium DHCP Client 4.4.1 Copyright 2004-2018 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/eth0/40:8d:5c:4f:12:03 Sending on LPF/eth0/40:8d:5c:4f:12:03 Sending on Socket/fallback DHCPRELEASE of 10.0.0.100 on eth0 to 10.0.0.1 port 67 (xid=0x7eae9da6) Internet Systems Consortium DHCP Client 4.4.1 Copyright 2004-2018 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/eth0/40:8d:5c:4f:12:03 Sending on LPF/eth0/40:8d:5c:4f:12:03 Sending on Socket/fallback DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x57fdb020) DHCPOFFER of 10.0.0.100 from 10.0.0.1 DHCPREQUEST for 10.0.0.100 on eth0 to 255.255.255.255 port 67 (xid=0x20b0fd57) DHCPACK of 10.0.0.100 from 10.0.0.1 (xid=0x57fdb020) bound to 10.0.0.100 -- renewal in 41481 seconds. 

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Release and Renew IP Address (2021 How-To Guide)

Release and Renew IP address and fix network connectivity problems

Release/Renew IP address is a procedure meant to solve network connectivity issues related to cached IP information. It can be done via Command Line on Windows or System Preferences on Mac OS. Release and Renew IP address means giving up the lease of DHCP IP address of the host computer and making a request for a new IP address. First of all, the ipconfig /release command is used to give up current IP lease and send the server a DHCP alert to mark the old IP address as available. The second command – ipconfig /renew requests a new IP address.

These commands help to solve network connectivity problems that arise due to expired IP addresses or other minor computer bugs. It can help to solve IP-related issues and restore fully-functioning network connection instantly.

Related: How to Flush DNS Cache on Windows, Mac, Linux?

Follow the guide below to release and renew ip address on Windows 10, 8, 8.1, 7, Vista, XP, Mac and Linux. Make sure that your network adapter needs to be configured to Obtain IP address automatically, otherwise these commands won’t work.

How to Release and Renew IP Address on Windows, Mac, Linux

Windows 10, 8.1 and 8

To release and renew IP address on Windows 10, 8.1 or 8, follow the steps given below.

1. In Windows 10, 8 or 8.1, use Windows search to find Command Prompt .
2. Right-click on Command Prompt and select Run as Administrator option.
   ipconfig /release and press Enter.
3. Next, type ipconfig /renew and press Enter.
   Windows 7 and Vista

Follow these steps to use ipconfig /release and ipconfig/renew commands on Windows 7 or Vista.

1. Click on Windows menu, then type cmd in Windows search bar.
2. Right-click the Command Prompt result and choose Run as Administrator from the menu.
   ipconfig /release and press Enter.
3. Type ipconfig /renew and press Enter.
   Windows XP

1. Press START>All Programs>Accessories. Right-click Command Prompt and choose Run As…. Choose Administrator‘s account and enter password for it. Press OK.
   ipconfig /release and press Enter.
2. Now, type ipconfig /renew and press Enter to finish.
   Mac OS

1. Click the Apple logo in the top-left corner of the screen and select System Preferences. Linux/Ubuntu

The guide below provides an equivalent of ipconfig /release and ipconfig /renew commands on Linux. Use these steps to force DHCP Client to Renew IP Address.

1. Press CTRL+ALT+T to launch Terminal on Linux.
2. In Terminal, type sudo dhclient – r and press Enter to release current IP.
3. Then type sudo dhclient and press Enter to get a new IP address from DHCP server.
   Useful DNS Resolver Commands for Windows

• ipconfig /flushdns. This command helps to clear the DNS Resolver cache so that the new IP information would be fetched instantly.
• ipconfig /registerdns. This command refreshes all DHCP leases and registers DNS names from scratch.
• ipconfig /displaydns. Shows current contents stored in DNS Resolver Cache.

Fix IPconfig release renew not working

IPConfig /Release and /Renew commands work only if your network adapter is set to fetch the IP address automatically. In other words, you need to have DHCP enabled. You can configure these settings via Windows Network and Sharing Center.

1. Go to Network and Sharing Center, then select Change adapter settings.
2. Right-click your network adapter and open Properties.
3. Find Internet Protocol Version 4 ( TCP /IPv4) and click Properties.
4. Select Obtain IP Address automatically and click OK to save.

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Norbert Webb is the head of Geek’s Advice team. He is the chief editor of the website who controls the quality of content published. The man also loves reading cybersecurity news, testing new software and sharing his insights on them. Norbert says that following his passion for information technology was one of the best decisions he has ever made. “I don’t feel like working while I’m doing something I love.” However, the geek has other interests, such as snowboarding and traveling.

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Thread: Ubuntu equivalent of «ipconfig /renew»?

A Carafe of Ubuntu

Ubuntu equivalent of «ipconfig /renew»?

On Windows you can disable/renable the NIC in control panel/networking, and release/renew the IP address with ipconfig. How do you do these in Ubuntu?

First Cup of Ubuntu

Re: Ubuntu equivalent of «ipconfig /renew»?

I don’t know about the command-line equivalent, but you should be able to disable and re-enable your network via the NetworkManager GUI

Ubuntu addict and loving it

Re: Ubuntu equivalent of «ipconfig /renew»?

$ sudo /etc/init.d/networking restart

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