Comments on: /etc/network/interfaces Ubuntu Linux networking example

By: Sathishkumar

Sathishkumar — Thu, 19 Jan 2012 12:04:47 +0000

Thank you so much cyberciti..

By: joem

joem — Sat, 10 Sep 2011 10:40:13 +0000

Two ethernet interfaces, one connected to a trusted LAN, the other to
the untrusted Internet.

how to I configure this one.? right now Im having a problem on this one.

this is what i wrote on /etc/networ/interfaces
–
auto eth1
iface eth1 inet static
address 192.168.0.1
netmask 255.255.255.0
–
and nothing follow and i configure already my dhcpd.conf

By: zL

zL — Sun, 31 Jul 2011 12:52:41 +0000

Thanks! This article is just what I was looking for.
Much appreciated!

By: AnonymousCoward

AnonymousCoward — Wed, 27 Apr 2011 11:55:49 +0000

I had a similar issue. I ended up searching for the settings in my home directory with a command like this:
grep -R .
I found a file called all in my home directory with contents similar to /etc/network/interfaces. Deleting solved my problem.

By: Nick

Nick — Thu, 10 Feb 2011 16:02:57 +0000

Thanks for the article, very useful.
I’ve got a question to put out there:

I have a modified verison of linux (Ubuntu) installed (provided by a 3rd party). When running ifconfig -a, I can see that I have 2 IP’s configured to eth0 (one to eth0 and one to eth0:1).

They are both up, ‘ping-able’, and survive reboots.

My question is, my /etc/network/interfaces file only contains the information for eth0 (and lo) but with no reference to eth0:1. How can this be? Where else could eth0:1 be set?

By: nikobe

nikobe — Tue, 18 Jan 2011 21:29:37 +0000

Big thank you your example fixed my network woes after I fiddled with VPN settings and ended up with a dodgy connection.

By: Aaron Zacharkiw

Aaron Zacharkiw — Tue, 30 Nov 2010 23:06:14 +0000

My etc/network/interfaces file is completly blank. Can someone tell me how to get a DCHP connection set up along with a loopback address?

By: Ash Rocks

Ash Rocks — Mon, 29 Nov 2010 17:26:51 +0000

Ctrl + X buddy, It should help you save the edited file.
But its a good practice to take a backup of the file before editing.
Hope this helps.

By: HSAIN

HSAIN — Wed, 10 Nov 2010 22:48:55 +0000

how to edit and save this changes. I use nano command to edit but it can’t be saved.
(nano etc/network/interfaces)

By: Zach

Zach — Mon, 13 Sep 2010 15:50:37 +0000

Does anyone know if there exists a way to test a large file full or static IP aliases (about 30) and custom, static routes (about 80) for conflicts or issues without doing a network restart (and risking the interfaces not coming back up correctly)?

By: yo

yo — Sat, 28 Aug 2010 01:16:52 +0000

#: nano /etc/network/interfaces

##edit eth1 your dispositive
auto eth1
iface eth1 inet dhcp
##save

#:/etc/init.d/networking restart

By: timecmdr

timecmdr — Tue, 20 Jul 2010 09:06:12 +0000

Anon – The DNS settings reside in the /etc/resolv.conf file thats why they are not mentioned here.

They are set via DHCP if your using it otherwise you’ll need to add them manually.

Timecmdr

By: norb

norb — Mon, 26 Apr 2010 18:51:53 +0000

ubuntu has not abandoned /etc/network/interfaces, NetworkManager just handles interfaces NOT mentioned in that file.

However, I’m by far no expert, using ubuntu for years, starting my first ubuntu-server.
I don’t want much (SSH from Internet to my Machine, and from there in the network to my desktop) and it works sometimes.

I only configured interfaces, no bridge, no route.
eth1 is internet (router), eth0 network per dhcp (router).
How should i proceed?

By: Anonymous

Anonymous — Wed, 17 Mar 2010 06:39:49 +0000

Why the hell have you forgotten the dns settings?
Don’t you realise that not including the dns settings you won’t be able to surf the internet?

You need to insert the dns as follows:
dns-nameserver xxx.xxx.xxx.xxx
Where xxx.xxx.xxx.xxx is the ip address of your isp nameserver

By: Timmy

Timmy — Sat, 14 Nov 2009 14:44:50 +0000

I think Ubuntu has abandoned /etc/network/interfaces in favour of /etc/NetworkManager/system-connections/ , which is edited by the rather handy GUI tool System > Preferences > Network Connections.

By: Urederra

Urederra — Mon, 17 Aug 2009 19:19:41 +0000

And how do you tell the system what the network password is?

By: Susanne Blond

Susanne Blond — Mon, 29 Jun 2009 14:24:40 +0000

Great manual. Thank you for your work.

By: Vivek Gite

Vivek Gite — Mon, 22 Jun 2009 08:48:25 +0000

Are virtual IPs part of cluster?

By: Mogga

Mogga — Mon, 22 Jun 2009 07:41:31 +0000

How can I extend the two interface on one NIC example above to bridge a set of virtual servers on a host machine with the two interfaces on two different networks?
Am I looking for a bridge setup or is it more suited to tun/tap?
Here’s where I’ve started:
auto eth0 eth0:1 # physical network connected to my ISP router iface eth0 inet static address 192.168.1.50 network 192.168.1.0 netmask 255.255.255.0 gateway 192.168.1.254

# virtual network interface for servers iface eth0:1 inet static address 10.1.0.1 network 10.1.0.0 netmask 255.255.0.0
So now I need a bridge etc. to connect the physical and virtual machines!
Not sure where to get started…

By: Vivek Gite

Vivek Gite — Sun, 24 May 2009 14:33:41 +0000

Are you talking about storage?