네트워크 설정 파일로 직접 편집 할때가 더욱 편리 할 때가 있다.

CENTOS 7 기준으로

[root@mail ~]# vi /etc/sysconfig/network-scripts/ifcfg-enp1s0
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp1s0
#UUID=e805b29e-b6f5-4b57-b5d2-0b21508b21f5
DEVICE=enp1s0
ONBOOT=yes
ETHTOOL_OPTS="autoneg on"
IPADDR=xxx.168.168.xxx
PREFIX=24
#GATEWAY=xxx.145.221.xxx
DNS1=168.126.63.1
DNS2=168.126.63.2
ZONE=internal

[root@mail ~]# vi /etc/sysconfig/network-scripts/ifcfg-enp3s0
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp3s0
UUID=e805b29e-b6f5-4b57-b5d2-0b21508b21f5
DEVICE=enp3s0
ONBOOT=yes
ETHTOOL_OPTS="autoneg on"
IPADDR=xxx.145.221.xxx
PREFIX=27
#GATEWAY=xxx.145.221.xxx
DNS1=168.126.63.1
DNS2=168.126.63.2
ZONE=public

[root@mail ~]# vi /etc/sysconfig/network
# Created by anaconda
NETWORKING=yes
NETWORKING_IPV6=no
GATEWAY=xxx.145.221.xxx
GATEWAYDEV=enp3s0