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10
Feb

My Ubuntu 16.04 Networking is configured but I cannot find config files

If your Ubuntu machine has networking configured but there’s nothing in: /etc/network/interfaces (maybe only loopback interface is configured there) and there’s no file in /etc/network/interfaces.d then maybe the network was configured via Ubuntu’s GUI (Network Manager).

In that case the config file is located in /etc/NetworkManager directory.

10
Feb

Configure Networking in Ubuntu 16.04 Server

One way on some Ubuntu versions was to edit /etc/network/interfaces and add the the configuration of network interface. On Ubuntu 16.04 I’ve don the following setup:

# cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

And then we create a file in /etc/network/interfaces.d called enp0s3:

# cat enp0s3
auto enp0s3
iface enp0s3 inet static
  address 10.0.0.211
  broadcast 10.0.0.255
  netmask 255.255.255.0
  post-up route add default gw 10.0.0.1
  pre-down route del default gw 10.0.0.1
 
dns-nameservers 10.0.0.1
10
Feb

Configure Networking in OpenSUSE Linux with manual IPv4

Here is a Quick Guide to configure networking in OpenSUSE Linux using manual IPv4.

First let’s see where config files are located.

# ls /etc/sysconfig/network/ifcfg-*
/etc/sysconfig/network/ifcfg-eth0  /etc/sysconfig/network/ifcfg-lo
linux-t003:/home/ovi #

Edit /etc/sysconfig/network/ifcfg-eth0 file and add:

BOOTPROTO='static'
BROADCAST=''
ETHTOOL_OPTIONS=''
IPADDR='10.0.1.31/24'
MTU=''
NAME='82540EM Gigabit Ethernet Controller'
NETWORK=''
REMOTE_IPADDR=''
STARTMODE='auto'

Edit /etc/sysconfig/network/routes file and add:

default 10.0.1.1 -	-

Edit /etc/resolv.conf and add:

nameserver 10.0.1.1

Then we need to restart network service:

service network restart