CentOS7 네트워크 설정

네트워크 설정

# cd /etc/sysconfig/network-scripts/

# ls
ifcfg-enp0s3     ifdown-isdn    ifup-aliases  ifup-ppp
ifcfg-lo         ifdown-post    ifup-bnep     ifup-routes
ifdown           ifdown-ppp     ifup-eth      ifup-sit
ifdown-Team      ifdown-routes  ifup-ippp     ifup-tunnel
ifdown-TeamPort  ifdown-sit     ifup-ipv6     ifup-wireless
ifdown-bnep      ifdown-tunnel  ifup-isdn     init.ipv6-global
ifdown-eth       ifup           ifup-plip     network-functions
ifdown-ippp      ifup-Team      ifup-plusb    network-functions-ipv6
ifdown-ipv6      ifup-TeamPort  ifup-post

ls로 확인했을때, ifcfg-enp0s3 을 vi로 편집한다.

• 또는 ifcfg-enp0s3이 없고 ifcfg-ens33 일 수도 있음.

ifcfg-enp0s3 편집

# vi 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=156f29bf-12cf-46ed-b907-7310eb22e324
DEVICE=enp0s3
ONBOOT=yes

IPADDR=100.100.100.120
NETMASK=255.255.255.0
GATEWAY=100.100.100.2
DNS1=100.100.100.2

'동적 IP' 와  '고정 IP'

• BOOTPROTO 값을 dhcp가 아닌 static으로 하게되면 IP 주소를 IPADDR에 명시한 값으로 고정할 수 있음
• 반대로, dhcp로 하면 동적할당되어 무작위로 IP 주소를 할당 받음 (dhcp로 하는 경우, IPADDR을 쓸 필요없음)

설정된 IP 확인

참고. ifconfig 가 아니라 ip addr 를 사용해야 함.

# systemctl restart network
# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:8c:f8:05 brd ff:ff:ff:ff:ff:ff
    inet 100.100.100.120/24 brd 100.100.100.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet6 fd17:625c:f037:6464:c054:c7fd:5e95:dee0/64 scope global tentative noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::c265:3069:602a:7000/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

• 100.100.100.120로 할당된것을 확인할 수 있음