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FreeBSD: HowTo Change IP Address / Setup New IP Address For Existing Interface

In this quick post I will explain how to add and configuring a network card under FreeBSD operating system using command line options.

To display the current configuration for the network interfaces on your FreeBSD server, type the following command:
# ifconfig

How Do I Configure the Network Card Under FreeBSD?

You need to use the ifconfig command as follows to assign an IP address:
# ifconfig interfaceName inet IPAddress

To assign an ip to lnc0 interface, enter:
# ifconfig lnc0 inet

Please note that lnc0 is an ethernet interface name. It can be Obtained by tying the following command:
# ifconfig -a

FreeBSD Ntwork Card’s Configuration

To setup up ip address permanently open a file called /etc/rc.conf and append/modify network entries as follows:
# vi /etc/rc.conf
Setup values as follows:
ifconfig_lnc0="inet netmask"
### Default gateway ###

Save and close the file. Please note that ifconfig_lnc0 is Ethernet interface name. It can be Obtained using ifconfig -a command.

You can restart networking service using the following command:
# /etc/rc.d/netif restart && /etc/rc.d/routing restart

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{ 11 comments… add one }
  • Anonymous September 5, 2005, 7:25 pm

    Thanks for this tip. It was very helpful

  • Hyip July 19, 2008, 9:25 am

    Could you please set up an .exe file to do the above procedure
    I think making a .exe file with the above commands will make the job easier for repeatedly changing ip addresses

  • Claus Larsen December 16, 2008, 1:08 pm

    An exe file, do you have any idea about what you are saying, exe files is a windows thing.

  • Senphet December 15, 2009, 9:31 pm

    .exe for bsd!? thanks for the good laugh ; )

  • wakka wakka September 10, 2010, 10:49 pm

    lmao, maybe he meant a .bat file not .exe!

  • ozy-ns December 20, 2010, 1:47 pm

    The .bat file is from windows too ;)

  • TnyTm February 17, 2011, 2:44 pm

    Friggen windows nerds with your exe and bat files. However can you create a vbs script perhaps. I like the idea of changing the IP address easily from script. vbs would be nice.

  • Joe's Morgue April 2, 2012, 12:00 pm

    I’m VERY much a beginner with *nix of ANY form [including FreeBSD] AND I can’t spell, but….

    .EXE and .BAT are NOT from Windows. They are from the days of DOS, which was usable within Windows….

    He is using a term he [and you] understood from his DOS [Windows] experience…

  • Mohammed Khalid February 2, 2013, 5:34 am

    Thanks a lot

  • Jason May 2, 2014, 4:29 pm


    Just goes to show, that helpdesk staff shouldnt work on network stuff

  • John Stepp February 11, 2015, 9:07 pm

    making a binary for this seems a little overkill.
    alias setnet ‘ee /etc/rc.conf’
    alias restartnet ‘/etc/rc.d/netif restart && /etc/rc.d/routing restart’

    (I know, ee; I just do not want to relearn vi at my age.)

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