Enabling IPv6 in the virtual machines on the Fedora 35

On Fedora when we create a Virtual Machine (via libvirt) we get an IPv4 address (NAT). But for my experiment I wanted a NATed IPv6 address. With the following steps one can get NATed IPV6 address on VMs.

On the host

First, stop the default network and edit the configuration

# virsh net-destroy default
# virsh net-edit default

Add the following for IPv6.

  <ip family='ipv6' address='fd01:db8:dead:beef:fe::2' prefix='96'>
       <range start='fd01:db8:dead:beef:fe::1000' end='fd01:db8:dead:beef:fe::2000' />

Now restart the network.

# virsh net-start default

Configuring the VM (Debian 11)

Debian VM never got the IPv6 address from DHCP. Followed these steps to get one:

Edit the /etc/network/interfaces to add the following line iface enp1s0 inet6 dhcp at the end. Now the file looks following :

# The primary network interface
allow-hotplug enp1s0
iface enp1s0 inet dhcp
iface enp1s0 inet6 dhcp

By adding iface enp1s0 inet6 dhcp in the /etc/network/interfaces file
we are actually telling network interface to get an IPv6 address from DHCP.

Reboot the system and check the IP address.

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