[ovs-discuss] GRE tunnel - no ping reply

Luca Prete luca.prete at garr.it
Fri Mar 1 06:46:37 UTC 2013


To make openflow switches communicates with the controller they should have L3 connectivity, sp they should ping one each other!

Luca P.

Il giorno 01/mar/2013, alle ore 06:14, Jesse Gross <jesse at nicira.com> ha scritto:

> 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.
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