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--- hardware:gretunnel [2019/01/07 11:41] – [Create other side of tunnel on Trisul probe node] veera
+++ hardware:gretunnel [2023/04/10 20:06] (current) – [Setting up a GRE Tunnel to send Netflow to remote machine] veera
@@ Line 4: / Line 4: @@
 This document explains how to setup a point to point GRE Tunnel which will be used to route Netflow packets to a remote Trisul.
 The gateway machine is at one end of the tunnel, the Trisul server is at the other end. All  your routers can send Netflow to the Gateway machine on port 2055, or 5111. They will be send to the Trisul server through the tunnel.
 Substitute the following settings in this guide to suit your environment
@@ Line 12: / Line 12: @@
   - Port used : UDP 5111
   - GRE tunnel for the point to point tunnel : 10.200.200.200/30  (not visible outside)
+===== Ensure kernel module ip_gre is loaded  =====
+On the machine ensure the ip_gre kernel module is loaded. If you are using a LXC or Docker container ensure the kernel on the host has the module loaded
+<code>
+modprobe ip_gre
+</code>
+Loading this kernel module will create a device called gre0
 ===== Setup GRE on the gateway node =====
@@ Line 69: / Line 83: @@
-====== Run Trisul on gre1 in LIBPCAP mode ======
+===== Run Trisul on gre1 in LIBPCAP mode =====
-Now the Trisul Probe node will get all the router netflows on the new gre1 interface.
+Now, the Trisul Probe node will redeive all the router netflows on the **new gre1** interface.
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