http://lartc.org/howto/lartc.tunnel.gre.html
http://ask.xmodulo.com/create-gre-tunnel-linux.html
https://www.linickx.com/gre-example-for-centosrhel
GRE is a tunneling protocol that was originally developed by Cisco, can also use with Linux. We need to load the gre kernel module, and also set it to load at boot time:
modprobe ip_gre
Now set it to start at boot:
echo "/sbin/modprobe ip_gre > /dev/null 2>&1" > /etc/sysconfig/modules/ip_gre.modules && chmod 755 /etc/sysconfig/modules/ip_gre.modules
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