Hi everyone, So a colleague and I are trying to setup an experiment with GRE tunnels and unfortunately we are unable to get everything working the way we want ...
We have three machines with two NICs each (we keep one for SSH) we have installed OpenvSwitch 2.3.2 in the three of them, attached one of the two NIC to OVS and ifconfig the ovs interface to have the IP of NIC. At this point we have three hosts each with an *ovsbr0 *bridge and the IPs 192.168.0.1, 192.168.0.2, 192.168.0.3. What we want to is to redirect all the traffic from 192.168.0.1 to 192.168.0.3 through 192.168.0.2, we have established a GRE tunnel between 1->2 and 2->3. On 192.168.0.1 I can quite easily send all the traffic over the GRE tunnel and can see it on 192.168.0.2, however this is where I run into problems. I'm trying to decapsulate it (remove the GRE header) to send it on the gre tunnel from 192.168.0.2 to 192.168.0.3. If I send it directly I get a GRE packet within a GRE packet which doesn't work ... I also have tried on 192.168.0.2 to match incomming packet with a tunnel id of 0xa (this is the options:key of the gre tunnel) but no packet is matched. Would anybody have some suggestions on how to solve the problem if possible ? Let me know if something is unclear and I will try to go into bit more details. Best regards, Simon
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