Trisul Network Analytics
Developer Zone

**This is an old revision of the document!** ----

On the gateway machine with IP 192.169.2.81 Stop firewalld or ufw <code> ufw disable </code> <code> ip tunnel add gre1 mode gre remote 192.168.2.99 local 192.168.2.81 ttl 255 ip link set gre1 up ip addr add 10.200.200.201/30 dev gre1 </code> Confirm the route is present <code> ip route 10.200.200.200/30 dev gre1 proto kernel scope link src 10.10.10.99 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.2.0/24 dev enp2s0 proto kernel scope link src 192.168.2.99 </code> Use IPTables to NAT to the remote GRE <code> iptables -t nat -A PREROUTING -p udp --dport 5111 -j DNAT --to-destination 10.200.200.202:5111 </code> On the Trisul probe machine with real IP 192.168.2.99 <code> ip tunnel add gre1 mode gre remote 192.168.2.81 local 192.168.2.99 ttl 255 ip link set gre1 up ip addr add 10.200.200.202/30 dev gre1 </code> Credits Creating a GRE tunnel http://ask.xmodulo.com/create-gre-tunnel-linux.html