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

Sara June

4/21/23, 4:25 PM

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?

1212

0 + 0

networking

ubuntu

hyper-v

linux-networking

ipv4

Score:1

Server

shearn89

4/22/23, 9:36 AM

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.

Additional info here: https://www.server-world.info/en/note?os=Ubuntu_21.04&p=dhcp&f=2

0 + 0

Sara June

4/23/23, 7:36 AM

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.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

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

TH: วิธีแก้ไข ubuntu ไม่ได้รับที่อยู่ ip บน hyper-v

RO: Cum să remediați, ubuntu nu primește adresa IP pe hyper-v?

RU: Как исправить, Ubuntu не получает IP-адрес на Hyper-V?

VI: Làm cách nào để khắc phục, Ubuntu không nhận được địa chỉ IP trên hyper-v?

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