Configure static IP in Ubuntu 20.04 via the CLI
Doing some lab testing, and needed to add another interface on an Ubuntu server virtual machine.
Quickly added it via the host (TrueNAS), but it came unconfigured and uninitialized.
The interface is in a down state, so it doesn't show up in ifconfig without using a switch:
ifconfig
enp0s4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.245 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::2a0:98ff:fe0a:8b09 prefixlen 64 scopeid 0x20<link>
ether 00:a0:98:0a:8b:09 txqueuelen 1000 (Ethernet)
RX packets 648 bytes 98987 (98.9 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 142 bytes 22349 (22.3 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 (Local Loopback)
RX packets 172 bytes 13404 (13.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 172 bytes 13404 (13.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
To get it to show up, we need to use the -a switch, which will show all interfaces, even if they are down.
ifconfig -a
enp0s4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.245 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::2a0:98ff:fe0a:8b09 prefixlen 64 scopeid 0x20<link>
ether 00:a0:98:0a:8b:09 txqueuelen 1000 (Ethernet)
RX packets 677 bytes 101586 (101.5 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 158 bytes 26065 (26.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s5: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 00:a0:98:67:56:d9 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
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 172 bytes 13404 (13.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 172 bytes 13404 (13.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
For my lab testing purposes, I needed to configure an address on separate network than my DHCP server hands out, so I needed to manually configure an IP address.
Create the configuration yaml file in /etc/netplan/, in this case the file is /etc/netplan/05-10net.yaml :
network:
version: 2
renderer: networkd
ethernets:
enp0s5:
dhcp4: no
addresses:
- 10.10.10.245/24
gateway4: 10.10.10.1
nameservers:
addresses: [10.10.10.15]
After the yaml file is created, apply the new network config:
sudo netplan apply
The new interface now shows up, and is configured with the address I needed:
ifconfig
enp0s4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.245 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::2a0:98ff:fe0a:8b09 prefixlen 64 scopeid 0x20<link>
ether 00:a0:98:0a:8b:09 txqueuelen 1000 (Ethernet)
RX packets 1977 bytes 251487 (251.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 700 bytes 131631 (131.6 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.10.10.245 netmask 255.255.255.0 broadcast 10.10.10.255
inet6 fe80::2a0:98ff:fe67:56d9 prefixlen 64 scopeid 0x20<link>
ether 00:a0:98:67:56:d9 txqueuelen 1000 (Ethernet)
RX packets 43 bytes 8269 (8.2 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 586 (586.0 B)
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 196 bytes 15444 (15.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 196 bytes 15444 (15.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0