[ovs-discuss] GRE tunnel - no ping reply

[Jesse Gross]

On Thu, Feb 28, 2013 at 8:53 PM, krishna kumar <ipower2 at yahoo.com> wrote:
> 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?

You're trying to ping between two different subnets.  You need a
router in between to do that.