First principles
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Using ifconfig
Show interface configuration
$ ifconfig eno1
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.79 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::a6a5:87ad:cb7a:6cad prefixlen 64 scopeid 0x20<link>
ether 50:eb:f6:3f:27:61 txqueuelen 1000 (Ethernet)
RX packets 137223 bytes 104941638 (104.9 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 91146 bytes 22484489 (22.4 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xa1400000-a1420000
Show All interfaces
$ ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255
ether 92:51:fc:1b:36:38 txqueuelen 1000 (Ethernet)
RX packets 277 bytes 28650 (28.6 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 899 bytes 129148 (129.1 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
br-b737ea16f9fc: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.25.0.1 netmask 255.255.0.0 broadcast 172.25.255.255
ether 02:42:79:64:bc:e2 txqueuelen 0 (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
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:db:62:09:42 txqueuelen 0 (Ethernet)
.....
Add ip alias
$ ifconfig eth0:1 10.10.20.218 netmask 255.255.255.0 broadcast 10.10.20.255
Using ip
ip Usage
ip help
ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether 50:eb:f6:3f:27:61 brd ff:ff:ff:ff:ff:ff
altname enp0s31f6
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
link/ether 52:54:00:1f:16:1e brd ff:ff:ff:ff:ff:ff
4: br-b737ea16f9fc: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default
link/ether 02:42:72:e2:a7:bb brd ff:ff:ff:ff:ff:ff
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default
link/ether 02:42:25:da:f1:ee brd ff:ff:ff:ff:ff:ff
ip address show\
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: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 50:eb:f6:3f:27:61 brd ff:ff:ff:ff:ff:ff
altname enp0s31f6
inet 192.168.1.80/24 brd 192.168.1.255 scope global eno1
valid_lft forever preferred_lft forever
inet 172.14.0.2/24 brd 172.14.0.255 scope global eno1
valid_lft forever preferred_lft forever
inet6 fe80::52eb:f6ff:fe3f:2761/64 scope link
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:1f:16:1e brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: br-b737ea16f9fc: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:72:e2:a7:bb brd ff:ff:ff:ff:ff:ff
inet 172.25.0.1/16 brd 172.25.255.255 scope global br-b737ea16f9fc
valid_lft forever preferred_lft forever
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:25:da:f1:ee brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
add ip alias
$ ip a add 192.168.178.2/24 dev eth0