How to fix, ubuntu not getting ip address on hyper-v?

Question

I am using hyper-v as a hypervisor and installed ubuntu 21 on it.

There, whenever I start the VM, the eth0 (only one network interface connected,Default Switch of Hyper-v) is not getting IP and showing as down.

Please bare with my snaps, as I can't ssh to the machine to copy the output and paste here as text.

There is no /etc/network/interfaces file on my machine, as many forum questions modifying content on this file.

To make this network adapter up, I ran below command.

sudo ip link set eth0 up

Then, the network adapter is up now but without ip4 address.

To get ip address, I ran below command and it gets ip.

sudo dhclient eth0

Then, I get IPv4 address.

I need to do this every time I on the machine.

How to fix this?

shearn89 · Accepted Answer · 2021-12-22 09:36:38Z

4

Ubuntu now uses netplan for network config. There's an article that looks helpful here: https://linuxconfig.org/netplan-network-configuration-tutorial-for-beginners

But a relevant snippet that might need to go in /etc/netplan/01-netcfg.yaml or similar:

network:
    version: 2
    renderer: NetworkManager
    ethernets:
        eth0:
            dhcp4: true

...then run sudo netplan apply.

answered Dec 22, 2021 at 9:36

shearn89

3,5502 gold badges17 silver badges40 bronze badges

1

There is a file /etc/netplan/00-installer-config.yaml. I edited that, and it seems there are other entries in it(enp0s3,enp0s4) but not eth0, so I added one more similar entry for eth0 and as you shared and it is working. Thank you very much for your answer.
– Sara June
Commented Dec 23, 2021 at 7:36

Add a comment |

1 Answer 1