CentOS 7에서 고정 IP를 설정하는 방법

CentOS 7에서 고정 IP를 설정하는 방법

테스트 환경

cat /etc/redhat-release 
CentOS Linux release 7.9.2009 (Core)

ifconfig 명령 설치

yum install -y net-tools

ifconfig 명령으로 인터페이스 확인

ifconfig

$ ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.62  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::812d:fb4:4b81:82c5  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:77:8e:c3  txqueuelen 1000  (Ethernet)
        RX packets 19447  bytes 27175941 (25.9 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2165  bytes 230943 (225.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 4  bytes 336 (336.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4  bytes 336 (336.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ip a

ifcfg-enp0s3 설정 확인

vim /etc/sysconfig/network-scripts/ifcfg-enp0s3

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=98fd22b9-ff76-44a9-b81d-4d6b532271cd
DEVICE=enp0s3
ONBOOT=yes

고정 ip 설정

BOOTPROTO=static

IPADDR=192.168.0.62

NETMASK=255.255.255.0

GATEWAY=192.168.0.1

vim /etc/sysconfig/network-scripts/ifcfg-enp0s3

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=98fd22b9-ff76-44a9-b81d-4d6b532271cd
DEVICE=enp0s3
ONBOOT=yes
IPADDR=192.168.0.62
NETMASK=255.255.255.0
GATEWAY=192.168.0.1

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nmtui 명령으로 편집

nmtui edit enp0s3

 

network 재시작

systemctl restart network

resolv.conf 설정

cat <<EOF > /etc/resolv.conf
nameserver 168.126.63.1
nameserver 8.8.8.8
nameserver 1.1.1.1
EOF

추가 nic card 상세 정보 확인

ethtool enp0s3

$ ethtool enp0s3
Settings for enp0s3:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: umbg
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

 

참고URL

- 리눅스 network configuration : https://scbyun.com/95

- 우분투 22.04 systemd-resolved 데몬(서비스) 비활성화 : https://scbyun.com/1248