Is bridge network setting an option to you?
I expect you need to configure it to provide external connectivity.
Unfortunately no. I need/want this VM to be isolated from the rest of my network. I know I could create a complex configuration using VLANs and FW rules but that’s a lot of work.
This worked out of the box with Debian so I would assume/hope it would work on OS TW too. I’m not sure what I need to do to provide external connectivity.
Thank you all for the responses. My next question is: How can I restore the ability for a virtual machine to access the internet? I understand that something regarding iptables and nftables changed when the virtualization packages updated. Before, IIRC, VMs could connect to the internet via bridge networking automatically. What steps are now required to achieve this? Thanks!
Okay, after looking through various other distro forums (here, I found the following workaround that appears to work! It uses the legacy iptables backend instead of the new nftables. This allows me to successfully ping gnu.org in the VM guest OS, at least until I better understand how to configure the nftables to get it working properly.
# Use the legacy iptables backend for now
sudo vim /etc/libvirt/network.conf
# Set this value
firewall_backend = "iptables"
# Save and quit
# Then, restart the service
sudo systemctl restart virtnetworkd
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