Check NetworkManager is DHCP or Static with command line Ubuntu

Question

How can I check the GUI network setting is set DHCP or Static with command line? for the active and connected interface in Ubuntu 18.04

I want one line command like grep give me static/dhcp or true/false

score 3 · Accepted Answer · answered Apr 21 '20 at 14:58

Can use ip command to check interface you're interested in.

E.g. to check the interface eth0:

if ip -6 addr show eth0  | grep -q dynamic; then
    echo "Uses DHCP addressing"
else
    echo "Uses static addressing"
fi

-6 option is for checking IPv6 interface. You can use -4 for IPv4.

score -1 · Answer 2 · answered Apr 21 '20 at 14:41

-1

nmcli -f ipv4.method con show

If the output is auto, then it is DHCP. If the output is manual, then it is static.

or

cat /etc/network/interfaces

DHCP enabled

auto eth0

iface eth0 inet dhcp

answered Apr 21 '20 at 14:41

idan

`nmcli -f ipv4.method con show` show error, in 18.04 `/etc/network/interfaces` replace with netplan – Fakhamatia Apr 23 '20 at 01:10
`nmcli -f ipv4.method con show` doesn't work. – DustWolf Sep 17 '21 at 23:02
Use `nmcli con show` to list connections, then `nmcli con show | grep ipv4.method` works for me. – Yaiba Jul 05 '22 at 08:01

2 Answers2