From 59a4afc0ea2f33a5acd0cdb69ebf05cb3d708468 Mon Sep 17 00:00:00 2001
From: mad <mad@noreply.nativenet.ch>
Date: Tue, 13 Nov 2018 17:14:22 +0000
Subject: [PATCH] Update page 'Installation'

---
 Installation.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Installation.md b/Installation.md
index 2ce0753..66cbf9b 100644
--- a/Installation.md
+++ b/Installation.md
@@ -78,3 +78,9 @@ After that, you should be able to access /nlvmi with a webbrowser. Create a new
 
 Do not forget to load the tun and tap kernel modules on the nodes.
 
+It might also be necessary to open up ports on the firewall.
+On Centos this could be used to do so:<br/>
+```firewall-cmd --zone=public --add-port=5700-6000/tcp --permanent```<br/>
+```firewall-cmd --reload```<br/>
+
+