GRETunnel
This
sample demonstrates IP over GRE tunneling. For each outgoing IP
packet application inserts GRE header before the IP header. For
each incoming packet application checks if it has the GRE header
and removes it. In order to test the application you have to run it
on two systems connected over network. While the applications are
active these two systems will be able to communicate over network
with each other (over GRE tunnels) but won't be able to communicate
with any other system.
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