I'm running a CentOS Linux release 7.2.1511 (Core) 64-bit on an Oracle VM VirtualBox and I wanted my local machine (Windows) to be able to connect to my VM because I want to use it for local hosting for testing. To my understanding, to be able to achieve this I have to use Bridged Adapter. I checked several sites on how to configure my network and found this configuration for enp0s3:

DEVICE=enp0s3
HWADDR=your_mac_addr
TYPE=Ethernet
UUID=your_UUID
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
IPADDR=192.168.0.35
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
DNS1=8.8.8.8
IPV6INIT=no
USERCTL=no

The problem is, when I tried to follow this and set my adapter to Bridged in Oracle VirtualBox my Machine suddenly cannot connect to the internet. Originally my VM can connect to internet as well as ping my local machine, just not the other way around.

On windows:

• IP: 10.120.20.71
• Subnet Mask: 255.255.255.0
• Default Gateway :10.120.20.1

On CentOS7:

TYPE="Ethernet"
BOOTPROTO=none
NM_CONTROLLED=no
USERCTL=no
IPADDR=10.0.2.15
GATEWAY=10.120.20.1
NETMASK=255.255.255.0
DNS1=8.8.8.8
DEFROUTE="yes"
PEERDNS="yes"
PEERROUTES="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="enp0s3"
UUID=<UUID>
DEVICE="enp0s3"
ONBOOT="yes"

I also found this and tried configuring ifcfg-enp0s3, /etc/sysconfig/network and /etc/resolv.conf and the same thing happens.

1 Answer

The steps provided in the link (that you attached) gist work fine. Probably you forgot to change the line : "BOOTPROTO=none" to "BOOTPROTO=static". Also the gateway should be defined in /etc/sysconfig/network rather than ifcfg-enp0s3.
Below the steps described in the link with some modifications:

Configure enp0s3

#vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

DEVICE=enp0s3
NM_CONTROLLED=yes
ONBOOT=yes
HWADDR=<Your MAC @>
TYPE=Ethernet
BOOTPROTO=static
NAME=enp0s3
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
IPADDR=192.168.1.44
NETMASK=255.255.255.0

Configure Default Gateway

#vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=centos6
GATEWAY=192.168.1.1

Configure DNS Server

#vi /etc/resolv.conf

nameserver 8.8.8.8 # Replace with your nameserver ip
nameserver 192.168.1.1 # Replace with your nameserver ipenter code here

restart NetworkManager and network

$systemctl restart NetworkManager
$systemctl restart network

PS : ahh didn't seen the above comments, any way just to mention all the steps as advised by music2myear in the comment below.