Let's start with a clean snapshot of our Ubuntu virtual machine, and install the nftables package.
The command-line utility for nftables is nft. You can either do nft commands from the Bash shell, or you can do sudo nft -i to run nft in interactive mode. For our present demos, we'll just run the commands from the Bash shell.
Now, let's take a look at the list of installed tables:
sudo apt install nftablessudo nft list tables
Hmmm... You didn't see any tables, did you? So, let's load some up.
If you look at the nftables.conf file in the /etc directory, you'll see the beginnings of a basic nft firewall configuration:
#!/usr/sbin/nft -fflush rulesettable inet filter { chain input { type filter hook input priority ...
