Hi.. I'm relatively new to OVS and GRE tunnel and not sure if my setup is 
working.
My setup is this:

10.x.x.x ----  50.x.x.x 
------------GRE------------------108.x.x.x----192.168.x.x

I'm ping 192.168.x.x from 10.x.x.x.
Wireshark shows that the ICMP request with GRE encapsulation arrived from 
10.x.x.x to 192.168.x.x.
I can also see the decapsulated ICMP request in Wireshark. But no ICMP reply is 
generated, instead a bunch of ARP requests are generated for the 10.x.x.x 
network which I see in Wireshark on 192.168.x.x host.

Is ping supposed to work in this setup above? Is there any other easy way to 
test if the GRE tunnel is working? 

Any suggestion is highly appreciated.
Thanks!
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