[Linux Network] 03. ifconfig 명령어

01. ifconfig 명령어

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네트워크 인터페이스의 정보를 조회하고, IP 주소, MAC 주소, 네트워크 마스크 등의 정보를 표시함

a) 명령 형식

ifconfig [옵션] [인터페이스]

b) 옵션

옵션	설명
-a	모든 인터페이스를 표시
-s	요약된 정보를 표시
-v	자세한 정보를 표시
up	인터페이스를 활성화
down	인터페이스를 비활성화
mtu N	MTU(최대 전송 단위) 값을 설정
netmask addr	netmask 값을 설정
broadcast addr	broadcast 값을 설정
ether mac_addr	MAC 주소를 변경

c) 명령 예시

📜 인터페이스의 정보 표시

$ ifconfig
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.2.191  netmask 255.255.255.0  broadcast 10.1.2.255
        inet6 fe80::20c:29ff:fea0:ba90  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:a0:ba:90  txqueuelen 1000  (Ethernet)
        RX packets 5293  bytes 381237 (381.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2215  bytes 243503 (243.5 KB)
        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 863  bytes 66416 (66.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 863  bytes 66416 (66.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

# 모든 인터페이스의 정보 표시
$ ifconfig -a
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.2.191  netmask 255.255.255.0  broadcast 10.1.2.255
        inet6 fe80::20c:29ff:fea0:ba90  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:a0:ba:90  txqueuelen 1000  (Ethernet)
        RX packets 5348  bytes 384911 (384.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2246  bytes 247719 (247.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens34: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 00:0c:29:a0:ba:9a  txqueuelen 1000  (Ethernet)
        RX packets 161  bytes 218781 (218.7 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 81  bytes 6045 (6.0 KB)
        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 863  bytes 66416 (66.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 863  bytes 66416 (66.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

# 특정 인터페이스의 정보만 표시
$ ifconfig ens32
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.1.2.191  netmask 255.255.255.0  broadcast 10.1.2.255
        inet6 fe80::20c:29ff:fea0:ba90  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:a0:ba:90  txqueuelen 1000  (Ethernet)
        RX packets 5410  bytes 389551 (389.5 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2279  bytes 252819 (252.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

📜 특정 인터페이스 활성화/비활성화

# 활성화
$ ifconfig ens34 up

$ ifconfig ens34
ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.219.191  netmask 255.255.255.0  broadcast 192.168.219.255
        inet6 fe80::20c:29ff:fea0:ba9a  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:a0:ba:9a  txqueuelen 1000  (Ethernet)
        RX packets 164  bytes 219175 (219.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 92  bytes 6931 (6.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

# 비활성화
$ ifconfig ens34 down

$ ifconfig ens34
ens34: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 00:0c:29:a0:ba:9a  txqueuelen 1000  (Ethernet)
        RX packets 164  bytes 219175 (219.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 93  bytes 7001 (7.0 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

📜 인터페이스의 설정

$ ifconfig ens34 192.168.219.100 netmask 255.255.255.0 broadcast 192.168.219.255 mtu 1500 up

$ ifconfig ens34
ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.219.100  netmask 255.255.255.0  broadcast 192.168.219.255
        inet6 fe80::20c:29ff:fea0:ba9a  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:a0:ba:9a  txqueuelen 1000  (Ethernet)
        RX packets 164  bytes 219175 (219.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 99  bytes 7517 (7.5 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

📜 특정 인터페이스의 MAC 주소 변경

$ ifconfig ens34 hw ether 00:11:22:33:44:55

$ ifconfig ens34
ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.219.100  netmask 255.255.255.0  broadcast 192.168.219.255
        inet6 fe80::20c:29ff:fea0:ba9a  prefixlen 64  scopeid 0x20<link>
        ether 00:11:22:33:44:55  txqueuelen 1000  (Ethernet)
        RX packets 177  bytes 220419 (220.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 125  bytes 9467 (9.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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