How to set up IPv6 on an Azure Ubuntu 24.04 VM

Question

I'm running a Ubuntu 24.04 VM. I've set up IPv6 in the Azure VM settings as instructed by the documentation, and it appears to be set up correctly: just as I had private and public IPv4 addresses by default, I now also have private and public IPv6 addresses displayed in all the right places, attached to the VM NIC as far as I can tell.

Booting the VM after this assignment did not make them appear in the ip addr output, however. The private IPv4 address is there, but the private IPv6 is not.

The image is apparently using systemd-networkd for network configuration. I presume that it's not set up to handle IPv6 by default, since the VMs are not given IPv6 addresses by default.

Let's presume for the moment that everything is correctly configured on the Azure web UI side, and it's just the running VM that needs extra configuration.

What do I need to add to /run/systemd/network/ (or possibly elsewhere)? Currently, the relevant file there, 10-netplan-eth0.network contains this default content:

[Match]
Driver=hv_netvsc
PermanentMACAddress=

Answer 1

@J. Laiho

I launched a new Ubuntu 24.04 and attached an existing NIC with IPv4 and Ipv6 addresses. By default it was able to utilize IPv6.

This is what my network file looks like. Try updating yours to see if it resolves the issue.

root@vm24041:/home/azureuser# cat /run/systemd/network/10-netplan-eth0.network
[Match]
Driver=hv_netvsc
PermanentMACAddress=60:45:bd:b8:91:40
Name=eth0

[Network]
DHCP=yes
LinkLocalAddressing=ipv6

[DHCP]
RouteMetric=100
UseMTU=true

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