Gestion du réseau dans Ubuntu/Linux

• Configuration du réseau sous Linux/Ubuntu
• Netplan / Cloud-init
• ifconfig
• ip addr
• networkctl
• Commande DIG
• Commande NSLookup

ifconfig

thierry@binova-srv:~$ ifconfig
enp3s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.105  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fd00::1:213:72ff:fec3:6591  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::213:72ff:fec3:6591  prefixlen 64  scopeid 0x20<link>
        ether 00:13:72:c3:65:91  txqueuelen 1000  (Ethernet)
        RX packets 289  bytes 26973 (26.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 142  bytes 20336 (20.3 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  (Boucle locale)
        RX packets 16  bytes 1196 (1.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 16  bytes 1196 (1.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ip addr

thierry@binova-srv:~$ 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
3: enp3s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:13:72:c3:65:91 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.105/24 brd 192.168.1.255 scope global enp3s8
       valid_lft forever preferred_lft forever
    inet6 fd00::1:213:72ff:fec3:6591/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 7095sec preferred_lft 7095sec
    inet6 fe80::213:72ff:fec3:6591/64 scope link
       valid_lft forever preferred_lft forever

networkctl

thierry@binova-srv:~$ networkctl
IDX LINK             TYPE               OPERATIONAL SETUP
  1 lo               loopback           carrier     unmanaged
  3 enp3s8           ether              routable    configured
 
2 links listed.