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Not able to ping through GRE Tunnel

I'm trying to build a GRE tunnel between two Ubuntu machines. I followed this Documentation

to avoid all problems, the 2 concerned interfaces are directly linked and are in the same subnet

First host : 10.0.41...

Connect office to multiple customer VPNs

First time post here so if this is off topic please let me know where to ask this question.

A company that provides outsource billing services to multiple client companies using VPNs to each remote company location has aske...