diff --git a/host_vars/monitoring.adm.crans.org.yml b/host_vars/monitoring.adm.crans.org.yml
new file mode 100644
index 00000000..ddb21e60
--- /dev/null
+++ b/host_vars/monitoring.adm.crans.org.yml
@@ -0,0 +1,3 @@
+interfaces:
+  adm: eth0
+  srv_nat: eth1
diff --git a/lookup_plugins/ldap.py b/lookup_plugins/ldap.py
index 3174e79e..cdca475f 100644
--- a/lookup_plugins/ldap.py
+++ b/lookup_plugins/ldap.py
@@ -1,10 +1,18 @@
+"""
+To use this lookup plugin, you need to pass ldap:
+ssh -L 1636:172.16.10.1:636 172.16.10.1
+"""
+
 import ipaddress
 
 from ansible.errors import AnsibleError, AnsibleParserError
 from ansible.plugins.lookup import LookupBase
 from ansible.utils.display import Display
 
-import ldap
+try:
+    import ldap
+except ImportError:
+    raise AnsibleError("You need to install python3-ldap")
 
 display = Display()
 
diff --git a/plays/network-interfaces.yml b/plays/network-interfaces.yml
index 634c084c..d88f6e58 100755
--- a/plays/network-interfaces.yml
+++ b/plays/network-interfaces.yml
@@ -1,6 +1,6 @@
 #!/usr/bin/env ansible-playbook
 ---
-- hosts: voyager.adm.crans.org,boeing.adm.crans.org,fluxx.adm.crans.org,hodaur.adm.crans.org,unifi.adm.crans.org,kiwi.adm.crans.org
+- hosts: voyager.adm.crans.org,boeing.adm.crans.org,fluxx.adm.crans.org,hodaur.adm.crans.org,unifi.adm.crans.org,kiwi.adm.crans.org,monitoring.adm.crans.org
   vars:
     vlan:
       - name: srv