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<a href="#introduction" class="md-nav__link">
Introduction
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Setup Ansible
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Run Ansible
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Ansible Tasks
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Install dnsmasq, iptables-persistent
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Install traceroute
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Backup /etc/network/interfaces
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Update Network Config
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Backup /etc/dnsmasq.conf
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Configure dnsmasq
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Configure Network ifup
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Restart Network and dnsmasq
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Backup /etc/sysctl.conf
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Enable ipv4 forwarding
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Start ipv4 forwarding
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Configure iptables workaround
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Apply iptables workaround
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Configure iptables
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Apply iptables firewall
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traceroute test
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To Be Continued
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<a href="../ansible-kvm-router-lab-part-4/" class="md-nav__link">
Ansible KVM Router Lab Part 4
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<a href="../ansible-kvm-router-lab-part-3/" class="md-nav__link">
Ansible KVM Router Lab Part 3
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<a href="../ansible-kvm-router-lab-part-2/" class="md-nav__link">
Ansible KVM Router Lab Part 2
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<a href="../ansible-kvm-router-lab-part-1/" class="md-nav__link">
Ansible KVM Router Lab Part 1
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Add KVM Network With Virsh
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KVM On Arch
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RaspberryPi LTE-Failover Router With DNS Caching
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Clear Linux Encrypted XFS Root
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Ansible KVM Router Lab Part 5
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Ansible KVM Router Lab Part 5
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<li class="md-nav__item">
<a href="#introduction" class="md-nav__link">
Introduction
</a>
</li>
<li class="md-nav__item">
<a href="#setup-ansible" class="md-nav__link">
Setup Ansible
</a>
</li>
<li class="md-nav__item">
<a href="#run-ansible" class="md-nav__link">
Run Ansible
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</li>
<li class="md-nav__item">
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Ansible Tasks
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<li class="md-nav__item">
<a href="#install-dnsmasq-iptables-persistent" class="md-nav__link">
Install dnsmasq, iptables-persistent
</a>
</li>
<li class="md-nav__item">
<a href="#install-traceroute" class="md-nav__link">
Install traceroute
</a>
</li>
<li class="md-nav__item">
<a href="#backup-etcnetworkinterfaces" class="md-nav__link">
Backup /etc/network/interfaces
</a>
</li>
<li class="md-nav__item">
<a href="#update-network-config" class="md-nav__link">
Update Network Config
</a>
</li>
<li class="md-nav__item">
<a href="#backup-etcdnsmasqconf" class="md-nav__link">
Backup /etc/dnsmasq.conf
</a>
</li>
<li class="md-nav__item">
<a href="#configure-dnsmasq" class="md-nav__link">
Configure dnsmasq
</a>
</li>
<li class="md-nav__item">
<a href="#configure-network-ifup" class="md-nav__link">
Configure Network ifup
</a>
</li>
<li class="md-nav__item">
<a href="#restart-network-and-dnsmasq" class="md-nav__link">
Restart Network and dnsmasq
</a>
</li>
<li class="md-nav__item">
<a href="#backup-etcsysctlconf" class="md-nav__link">
Backup /etc/sysctl.conf
</a>
</li>
<li class="md-nav__item">
<a href="#enable-ipv4-forwarding" class="md-nav__link">
Enable ipv4 forwarding
</a>
</li>
<li class="md-nav__item">
<a href="#start-ipv4-forwarding" class="md-nav__link">
Start ipv4 forwarding
</a>
</li>
<li class="md-nav__item">
<a href="#configure-iptables-workaround" class="md-nav__link">
Configure iptables workaround
</a>
</li>
<li class="md-nav__item">
<a href="#apply-iptables-workaround" class="md-nav__link">
Apply iptables workaround
</a>
</li>
<li class="md-nav__item">
<a href="#configure-iptables" class="md-nav__link">
Configure iptables
</a>
</li>
<li class="md-nav__item">
<a href="#apply-iptables-firewall" class="md-nav__link">
Apply iptables firewall
</a>
</li>
<li class="md-nav__item">
<a href="#traceroute-test" class="md-nav__link">
traceroute test
</a>
</li>
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<a href="#to-be-continued" class="md-nav__link">
To Be Continued
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<li class="md-nav__item">
<a href="../ansible-kvm-router-lab-part-4/" class="md-nav__link">
Ansible KVM Router Lab Part 4
</a>
</li>
<li class="md-nav__item">
<a href="../ansible-kvm-router-lab-part-3/" class="md-nav__link">
Ansible KVM Router Lab Part 3
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</li>
<li class="md-nav__item">
<a href="../ansible-kvm-router-lab-part-2/" class="md-nav__link">
Ansible KVM Router Lab Part 2
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</li>
<li class="md-nav__item">
<a href="../ansible-kvm-router-lab-part-1/" class="md-nav__link">
Ansible KVM Router Lab Part 1
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</li>
<li class="md-nav__item">
<a href="../add-kvm-network-with-virsh/" class="md-nav__link">
Add KVM Network With Virsh
</a>
</li>
<li class="md-nav__item">
<a href="../kvm-on-arch/" class="md-nav__link">
KVM On Arch
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</li>
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<a href="../raspberrypi-lte-failover-router-with-dns-caching/" class="md-nav__link">
RaspberryPi LTE-Failover Router With DNS Caching
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<a href="../debian-11-nspawn-flutter-integration-test-server/" class="md-nav__link">
Flutter Integration Test Server in Debian 11 Nspawn Container
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Debian 11 TT-RSS
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Trent's Favorite Podcasts
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Test QR SVG Django
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Prosody Photo Uploads
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XMPP Apt Notification
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Apache Virtual Hosts
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SENDXMPP Handler for Python Logging
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Instruction For Tethering From Phone
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LMDE4 Custom Partitions for Disk Encryption
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Linux Move Cursor With Keyboard
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Simplified Raspberry Streaming
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Clear Linux Encrypted XFS Root
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Clear Linux Guest Virt Manager
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Faster Partitioning with Sgdisk
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LMDE3 XFS Full Disk Encryption
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Rewrite Hugo Themes Report In Python
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<li class="md-nav__item">
<a href="#introduction" class="md-nav__link">
Introduction
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<li class="md-nav__item">
<a href="#setup-ansible" class="md-nav__link">
Setup Ansible
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Run Ansible
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Ansible Tasks
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<li class="md-nav__item">
<a href="#install-dnsmasq-iptables-persistent" class="md-nav__link">
Install dnsmasq, iptables-persistent
</a>
</li>
<li class="md-nav__item">
<a href="#install-traceroute" class="md-nav__link">
Install traceroute
</a>
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Backup /etc/network/interfaces
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Update Network Config
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Backup /etc/dnsmasq.conf
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Configure dnsmasq
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Configure Network ifup
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Restart Network and dnsmasq
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Backup /etc/sysctl.conf
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Enable ipv4 forwarding
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Start ipv4 forwarding
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Configure iptables workaround
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Apply iptables workaround
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Configure iptables
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Apply iptables firewall
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traceroute test
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To Be Continued
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<article class="md-content__inner md-typeset">
<h1>Ansible KVM Router Lab Part 5</h1>
<p>date: 2021-10-17</p>
<h2 id="introduction">Introduction</h2>
<p>This is Part 5 of a multi-part series of blog posts for building a
<a href="https://github.com/TrentSPalmer/router-lab" target="_blank">router lab</a>
automatically using a series of bash scripts and ansible.</p>
<p><a href="/posts/ansible-kvm-router-lab-part-1/" target="_blank">Ansible KVM Router Lab Part 1</a>
is an overview.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-2/" target="_blank">Ansible KVM Router Lab Part 2</a>,
I break down the script
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash" target="_blank">build_vms.bash</a>.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-3/" target="_blank">Ansible KVM Router Lab Part 3</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/define_bridge_networks.bash" target="_blank">define_bridge_networks.bash</a>
and
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/shutdown_vms.bash" target="_blank">shutdown_vms.bash</a>
scripts which are used to construct the lab.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-4/" target="_blank">Ansible KVM Router Lab Part 4</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/connect_vms_to_bridges.bash" target="_blank">connect_vms_to_bridges.bash</a>,
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/start_vms.bash" target="_blank">start_vms.bash</a>,
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/rebuild_known_hosts.bash" target="_blank">rebuild_known_hosts.bash</a>
scripts which are used to construct the lab.</p>
<p>In this post I explain how I use Ansible to finish constructing the lab.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-6/" target="_blank">Ansible KVM Router Lab Part 6</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/disconnect_vms_from_bridges.bash" target="_blank">disconnect_vms_from_bridges.bash</a>,
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/undefine_and_remove_vms.bash" target="_blank">undefine_and_remove_vms.bash</a>,
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/remove_bridge_networks.bash" target="_blank">remove_bridge_networks</a>
which are used to destroy the lab.</p>
<h2 id="setup-ansible">Setup Ansible</h2>
<ul>
<li>Configure ansible host file
<div class="highlight"><pre><span></span><code><span class="c1"># ~/.ansible.cfg</span>
<span class="k">[defaults]</span>
<span class="na">inventory</span> <span class="o">=</span> <span class="s">~/router-lab/ansible/hosts.yml</span>
</code></pre></div></li>
<li>Setup bashrc
<div class="highlight"><pre><span></span><code><span class="c1"># ~/.bashrc</span>
<span class="nb">export</span> <span class="nv">LIBVIRT_DEFAULT_URI</span><span class="o">=</span><span class="s2">"qemu+ssh://<user>@<server>/system"</span>
<span class="nb">alias</span> ansible-pb<span class="o">=</span>anspb
anspb<span class="o">()</span> <span class="o">{</span>
<span class="nv">ANS_DIR</span><span class="o">=</span>~/router-lab/ansible/playbooks<span class="p">;</span>
<span class="nb">echo</span> Changing to <span class="s2">"</span><span class="si">${</span><span class="nv">ANS_DIR</span><span class="si">}</span><span class="s2">"</span> and executing: ansible-playbook <span class="s2">"</span><span class="si">${</span><span class="p">@</span><span class="si">}</span><span class="s2">"</span>
<span class="o">(</span><span class="nb">cd</span> <span class="nv">$ANS_DIR</span> <span class="o">||</span> <span class="nb">exit</span> <span class="p">;</span> ansible-playbook <span class="s2">"</span><span class="si">${</span><span class="p">@</span><span class="si">}</span><span class="s2">"</span><span class="o">)</span>
<span class="o">}</span>
</code></pre></div></li>
<li>install apps
<div class="highlight"><pre><span></span><code>apt install ansible ansible-lint
</code></pre></div></li>
</ul>
<h2 id="run-ansible">Run Ansible</h2>
<p><div class="highlight"><pre><span></span><code>ansible-pb build_out_routers.yml -K
</code></pre></div>
or if you want to first update all the clients
<div class="highlight"><pre><span></span><code>ansible-pb update_and_build.yml -K
</code></pre></div></p>
<h2 id="ansible-tasks">Ansible Tasks</h2>
<p>This is an explaination of the tasks in the Ansible Playbook.
Playbooks are executed from top to bottom.</p>
<h3 id="install-dnsmasq-iptables-persistent">Install <code>dnsmasq</code>, <code>iptables-persistent</code></h3>
<p>This task is only run against the first and second lab clients as
they are the routers.</p>
<h3 id="install-traceroute">Install <code>traceroute</code></h3>
<p>Traceroute is parsed in a later task to confirm that traffic is
following the correct route.
(Also incidentally installs <code>needrestart</code> and <code>screen</code>.)</p>
<h3 id="backup-etcnetworkinterfaces">Backup <code>/etc/network/interfaces</code></h3>
<p>This is a simple bash command that tests if <code>/etc/network/interfaces.bak</code>
exists, and if not creates it.</p>
<h3 id="update-network-config">Update Network Config</h3>
<p>This task updates <code>/etc/network/interfaces</code> in all the lab clients
to describe the network interfaces needed to connect to each other.</p>
<p>For instance, here is the new <code>/etc/network/interfaces</code> file for <em>dnettwo</em>.
<div class="highlight"><pre><span></span><code><span class="c1"># /etc/network/interfaces</span>
<span class="c1"># This file describes the network interfaces available on your system</span>
<span class="c1"># and how to activate them. For more information, see interfaces(5).</span>
<span class="na">source /etc/network/interfaces.d/*</span>
<span class="c1"># The loopback network interface</span>
<span class="na">auto lo</span>
<span class="na">iface lo inet loopback</span>
<span class="c1"># The primary network interface</span>
<span class="na">allow-hotplug enp1s0</span>
<span class="na">iface enp1s0 inet dhcp</span>
<span class="c1"># The primary network interface</span>
<span class="na">allow-hotplug enp7s0</span>
<span class="na">iface enp7s0 inet dhcp</span>
<span class="na">auto enp8s0</span>
<span class="na">iface enp8s0 inet static</span>
<span class="na">address 10.4.4.1</span>
<span class="na">network 10.4.4.0</span>
<span class="na">netmask 255.255.255.0</span>
<span class="na">broadcast 10.4.4.255</span>
</code></pre></div></p>
<h3 id="backup-etcdnsmasqconf">Backup <code>/etc/dnsmasq.conf</code></h3>
<p>This is a simple bash command that tests if <code>/etc/dnsmasq.conf.bak</code>
exists, and if not creates it. (only applies to the two router clients)</p>
<h3 id="configure-dnsmasq">Configure <code>dnsmasq</code></h3>
<p>This task copies the templates for <code>/etc/dnsmasq.conf</code> to each of
the two router clients.</p>
<p><code>dnsmasq</code> is used to provide <em>DHCP</em> (and name resolution).
For instance, here is the new <code>/etc/dnsmasq.conf</code> for <em>dnetone</em>.
<div class="highlight"><pre><span></span><code><span class="c1"># /etc/dnsmasq.conf</span>
<span class="na">dhcp-range</span><span class="o">=</span><span class="s">10.5.5.50,10.5.5.150</span>
<span class="na">listen-address</span><span class="o">=</span><span class="s">127.0.0.1, 10.5.5.1</span>
</code></pre></div></p>
<h3 id="configure-network-ifup">Configure Network <em>ifup</em></h3>
<p>This applies to all the lab clients except for the first one,
changes the default route. A bash script is copied from
template to <code>/etc/network/if-up.d/ifup-script</code>.</p>
<p>For instance here is <code>ifup-script</code> for <em>dnetthree</em>.
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
<span class="c1"># /etc/network/if-up.d/ifup-script</span>
<span class="nv">default_dev</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>ip route <span class="p">|</span> head -1 <span class="p">|</span> awk <span class="s1">'{print $5}'</span><span class="k">)</span><span class="s2">"</span>
<span class="nb">echo</span> <span class="s2">"</span><span class="si">${</span><span class="nv">default_dev</span><span class="si">}</span><span class="s2">"</span>
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="si">${</span><span class="nv">default_dev</span><span class="si">}</span><span class="s2">"</span> <span class="o">==</span> <span class="s2">"enp1s0"</span> <span class="o">]</span>
<span class="k">then</span>
ip route del default via <span class="m">10</span>.55.44.1 dev enp1s0
<span class="k">fi</span>
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="si">${</span><span class="nv">default_dev</span><span class="si">}</span><span class="s2">"</span> !<span class="o">=</span> <span class="s2">"enp7s0"</span> <span class="o">]</span>
<span class="k">then</span>
ip route add default via <span class="m">10</span>.4.4.1 dev enp7s0
<span class="k">fi</span>
</code></pre></div></p>
<h3 id="restart-network-and-dnsmasq">Restart Network and <code>dnsmasq</code></h3>
<p>This is sequential:</p>
<ol>
<li><em>enp7s0</em> is restarted on <em>dnetone</em></li>
<li><code>dnsmasq</code> is restarted on <em>dnetone</em>, offering service on <em>enp7s0</em></li>
<li><em>enp7s0</em> and <em>enp8s0</em> are restarted on <em>dnettwo</em>, thus soliciting dhcp service on <em>enp7s0</em>, and triggering <code>/etc/network/if-up.d/ifup-script</code></li>
<li><code>dnsmasq</code> is restarted on <em>dnettwo</em>, offering service on <em>enp8s0</em></li>
<li><em>enp7s0</em> is restarted on <em>dnetthree</em>, <em>dnetfour</em>, and <em>dnetfive</em>, thus soliciting dhcp service on <em>enp7s0</em>, and triggering <code>/etc/network/if-up.d/ifup-script</code></li>
</ol>
<h3 id="backup-etcsysctlconf">Backup <code>/etc/sysctl.conf</code></h3>
<p>This is a simple bash command that tests if <code>/etc/sysctl.conf.bak</code>
exists, and if not creates it. (only applies to the two router clients)</p>
<h3 id="enable-ipv4-forwarding">Enable <em>ipv4 forwarding</em></h3>
<p>This is a simple bash command that uncomments the option for <em>ipv4 forwarding</em>
in <code>/etc/sysctl.conf</code>, applies only to the two routers.
<div class="highlight"><pre><span></span><code><span class="c1"># /etc/sysctl.conf</span>
<span class="na">...</span>
<span class="c1"># this</span>
<span class="c1">#net.ipv4.ip_forward=1</span>
<span class="na">...</span>
<span class="c1"># becomes this</span>
<span class="na">net.ipv4.ip_forward</span><span class="o">=</span><span class="s">1</span>
<span class="na">...</span>
</code></pre></div></p>
<h3 id="start-ipv4-forwarding">Start <em>ipv4 forwarding</em></h3>
<p>This simple bash command starts <em>ipv4 forwarding</em>, applies only
to the two routers.
<div class="highlight"><pre><span></span><code>bash -c <span class="s2">"sysctl -w net.ipv4.ip_forward=1"</span>
</code></pre></div></p>
<h3 id="configure-iptables-workaround">Configure <code>iptables</code> <em>workaround</em></h3>
<p>This applies only to the two router clients.
From <code>iptables</code>'s point of view, the ansible connection isn't a RELATED INPUT
connection, thus it is necessary to bring up a firewall in a two-step
process that involves first ACCEPTING RELATED OUTPUT connections in a workaround.</p>
<p>From ansible template, the following is copied to <code>/dev/shm/iptables_workaround</code>
<div class="highlight"><pre><span></span><code># /dev/shm/iptables_workaround
*filter
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
-A INPUT -j ACCEPT -m conntrack --ctstate ESTABLISHED,RELATED
-A OUTPUT -j ACCEPT -m conntrack --ctstate ESTABLISHED,RELATED
COMMIT
</code></pre></div></p>
<h3 id="apply-iptables-workaround">Apply <code>iptables</code> <em>workaround</em></h3>
<p>This applies only to the two router clients.
The following command is dispatched to apply the above <em>iptables_workaround</em>:
<div class="highlight"><pre><span></span><code>bash -c <span class="s2">"iptables-restore < /dev/shm/iptables_workaround"</span>
</code></pre></div></p>
<h3 id="configure-iptables">Configure <code>iptables</code></h3>
<p>This applies only to the two router clients.</p>
<p>From ansible template the following is copied to <code>/etc/iptables/rules.v4</code> on <em>dnetone</em>.
<div class="highlight"><pre><span></span><code>*nat
-A POSTROUTING -o enp1s0 -j MASQUERADE
COMMIT
*filter
-A INPUT -i lo -j ACCEPT
# allow ssh, so that we do not lock ourselves
-A INPUT -i enp1s0 -p tcp -m tcp --dport 22 -j ACCEPT
# allow incoming traffic to the outgoing connections,
# et al for clients from the private network
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# prohibit everything else incoming
-A INPUT -i enp1s0 -j DROP
COMMIT
</code></pre></div></p>
<p>From ansible template the following is copied to <code>/etc/iptables/rules.v4</code> on <em>dnettwo</em>.
<div class="highlight"><pre><span></span><code>*nat
-A POSTROUTING -o enp7s0 -j MASQUERADE
COMMIT
*filter
-A INPUT -i lo -j ACCEPT
# allow ssh, so that we do not lock ourselves
-A INPUT -i enp7s0 -p tcp -m tcp --dport 22 -j ACCEPT
# allow incoming traffic to the outgoing connections,
# et al for clients from the private network
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
# prohibit everything else incoming
-A INPUT -i enp7s0 -j DROP
COMMIT
</code></pre></div></p>
<h3 id="apply-iptables-firewall">Apply <code>iptables</code> firewall</h3>
<p>This applies only to the two router clients.
The following command is dispatched to apply the above from <code>/etc/iptables/rules.v4</code>:
<div class="highlight"><pre><span></span><code>bash -c <span class="s2">"iptables-restore < /etc/iptables/rules.v4"</span>
</code></pre></div></p>
<h3 id="traceroute-test"><code>traceroute</code> test</h3>
<p>The following script is dispatched to <em>dnettwo</em>:
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
<span class="nv">RESULT</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>traceroute <span class="m">8</span>.8.8.8<span class="k">)</span><span class="s2">"</span>
<span class="nv">FIRST_HOP</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span><span class="nb">echo</span> <span class="s2">"</span><span class="si">${</span><span class="nv">RESULT</span><span class="si">}</span><span class="s2">"</span> <span class="p">|</span> head -2 <span class="p">|</span> tail -1 <span class="p">|</span> awk <span class="s1">'{print $2}'</span><span class="k">)</span><span class="s2">"</span>
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="si">${</span><span class="nv">FIRST_HOP</span><span class="si">}</span><span class="s2">"</span> <span class="o">==</span> <span class="s2">"10.5.5.1"</span> <span class="o">]</span>
<span class="k">then</span>
<span class="nb">exit</span> <span class="m">0</span>
<span class="k">else</span>
<span class="nb">exit</span> <span class="m">1</span>
<span class="k">fi</span>
</code></pre></div>
The following script is dispatched to <em>dnetthree</em>, <em>dnetfour</em>, and <em>dnetfive</em>:
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
<span class="nv">RESULT</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>traceroute <span class="m">8</span>.8.8.8<span class="k">)</span><span class="s2">"</span>
<span class="nv">FIRST_HOP</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span><span class="nb">echo</span> <span class="s2">"</span><span class="si">${</span><span class="nv">RESULT</span><span class="si">}</span><span class="s2">"</span> <span class="p">|</span> head -2 <span class="p">|</span> tail -1 <span class="p">|</span> awk <span class="s1">'{print $2}'</span><span class="k">)</span><span class="s2">"</span>
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="si">${</span><span class="nv">FIRST_HOP</span><span class="si">}</span><span class="s2">"</span> !<span class="o">=</span> <span class="s2">"10.4.4.1"</span> <span class="o">]</span>
<span class="k">then</span>
<span class="nb">exit</span> <span class="m">1</span>
<span class="k">fi</span>
<span class="nv">SECOND_HOP</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span><span class="nb">echo</span> <span class="s2">"</span><span class="si">${</span><span class="nv">RESULT</span><span class="si">}</span><span class="s2">"</span> <span class="p">|</span> head -3 <span class="p">|</span> tail -1 <span class="p">|</span> awk <span class="s1">'{print $2}'</span><span class="k">)</span><span class="s2">"</span>
<span class="k">if</span> <span class="o">[</span> <span class="s2">"</span><span class="si">${</span><span class="nv">SECOND_HOP</span><span class="si">}</span><span class="s2">"</span> <span class="o">==</span> <span class="s2">"10.5.5.1"</span> <span class="o">]</span>
<span class="k">then</span>
<span class="nb">exit</span> <span class="m">0</span>
<span class="k">else</span>
<span class="nb">exit</span> <span class="m">1</span>
<span class="k">fi</span>
</code></pre></div></p>
<h2 id="to-be-continued">To Be Continued</h2>
<p>In <a href="/posts/ansible-kvm-router-lab-part-6/" target="_blank">Ansible KVM Router Lab Part 6</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/disconnect_vms_from_bridges.bash" target="_blank">disconnect_vms_from_bridges.bash</a>,
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/undefine_and_remove_vms.bash" target="_blank">undefine_and_remove_vms.bash</a>,
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/remove_bridge_networks.bash" target="_blank">remove_bridge_networks</a>
which are used to destroy the lab.</p>
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