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=== Step 7: Make iptables Rules Persistent ===

To make sure the iptables rules are applied after a reboot, you need to save them and configure them to load automatically on startup.

<ol style="list-style-type: decimal;">
<li><p>Install the iptables-persistent package:</p>
<pre>sudo apt install iptables-persistent</pre></li>
<li><p>During installation, you’ll be asked if you want to save the current iptables rules. Choose '''Yes'''.</p></li>
<li><p>If you’re not prompted, you can manually save the rules by running:</p>
<pre>sudo netfilter-persistent save</pre>
<blockquote><p>'''NOTE:''' Installing <code>iptables-persistent</code> is what allows your iptables rules to stick after a reboot. This is a server - you’re not going to turn this off very often. Nine months from now when you DO turn off this server, you’re not going to remember a single damn character from this guide; much less that iptables rule above! Nor will you remember that that rule not being present is why none of your virtual machines work.</p></blockquote></li>
<li><p>Confirm the rules are saved by checking the file at <code>/etc/iptables/rules.v4</code>.</p></li></ol>

With these changes, your bridge interface will now correctly allow traffic to flow through the virtual machines. The iptables rules will persist across reboots, and your virtual machines will be able to grab IP addresses from the same network as your host machine.

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