'How to know which network interface is for private ip?

I need to private ip for my linux(ubuntu) server.
so I checked ip add command.

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: enp35s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether d0:50:99:dd:49:43 brd ff:ff:ff:ff:ff:ff
    inet xxx.xxx.xxx.xxx/27 brd xxx.xxx.xxx.xxx scope global enp35s0
       valid_lft forever preferred_lft forever
    inet6 xxx::xxx:xxx:xxx:xxx/64 scope link
       valid_lft forever preferred_lft forever
3: enp36s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether d0:50:99:dd:49:44 brd ff:ff:ff:ff:ff:ff
4: br-cf41f234c44d: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:28:48:9c:52 brd ff:ff:ff:ff:ff:ff
    inet 172.23.0.1/16 brd 172.23.255.255 scope global br-cf41f234c44d
       valid_lft forever preferred_lft forever
    inet6 fe80::42:28ff:fe48:9c52/64 scope link
       valid_lft forever preferred_lft forever
5: br-7ad37758b346: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:cd:ca:cb:41 brd ff:ff:ff:ff:ff:ff
    inet 172.22.0.1/16 brd 172.22.255.255 scope global br-7ad37758b346
       valid_lft forever preferred_lft forever
    inet6 fe80::42:cdff:feca:cb41/64 scope link
       valid_lft forever preferred_lft forever
6: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:dd:5b:04:dd brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
7: br-031ff8fec9c6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:f9:58:b0:b8 brd ff:ff:ff:ff:ff:ff
    inet 172.18.0.1/16 brd 172.18.255.255 scope global br-031ff8fec9c6
       valid_lft forever preferred_lft forever
    inet6 fe80::42:f9ff:fe58:b0b8/64 scope link
       valid_lft forever preferred_lft forever
11: vethd7f8fb1@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-7ad37758b346 state UP group default
    link/ether a2:30:b9:fd:84:0a brd ff:ff:ff:ff:ff:ff link-netnsid 1
    inet6 fe80::a030:b9ff:fefd:840a/64 scope link
       valid_lft forever preferred_lft forever
99: veth9aeb459@if98: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-cf41f234c44d state UP group default
    link/ether 3a:6b:63:02:b9:f6 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::386b:63ff:fe02:b9f6/64 scope link
       valid_lft forever preferred_lft forever
189: vethf22836b@if188: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-7ad37758b346 state UP group default
    link/ether f6:b1:0d:40:18:44 brd ff:ff:ff:ff:ff:ff link-netnsid 2
    inet6 fe80::f4b1:dff:fe40:1844/64 scope link
       valid_lft forever preferred_lft forever

I could know enp35s0 is about the public IP and
number 4 to 189 is about the Docker.
So I think third interface, enp36s0 is for the private IP.
But I can't assure that. How do I check this?

linuxlinux-kernelip


Solution 1:[1]

You can use nmcli device status to check your device, type, status and connexion.
Then you can use (like you did) ip address and you can see your device enp35s0 in your case with the IP xxx.xxx.xxx.xxx:xxx/27 before the inet

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Dedey

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