CentOS 7 : KVM : Install : Server World

# add bridge "br0"

[root@dlp ~]#

nmcli c add type bridge autoconnect yes con-name br0 ifname br0

Connection 'br0' (0f4b7bc8-8c7a-461a-bff1-d516b941a6ec) successfully added.

# set IP for br0

[root@dlp ~]#

nmcli c modify br0 ipv4.addresses "10.0.0.30/24 10.0.0.1" ipv4.method manual

# set DNS for "br0"

[root@dlp ~]#

nmcli c modify br0 ipv4.dns 10.0.0.1

# remove the current setting

[root@dlp ~]#

nmcli c delete eno16777736

# add an interface again as a member of br0

[root@dlp ~]#

nmcli c add type bridge-slave autoconnect yes con-name eno16777736 ifname eno16777736 master br0

# stop and start NetworkManager

[root@dlp ~]#

systemctl stop NetworkManager; systemctl start NetworkManager

[root@dlp ~]#

ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> 
    mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether 00:0c:29:9f:9b:d3 brd ff:ff:ff:ff:ff:ff
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 22:f8:64:25:97:44 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 00:0c:29:9f:9b:d3 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.30/24 brd 10.0.0.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe9f:9bd3/64 scope link
       valid_lft forever preferred_lft forever