[ovs-dev] unexpected ARP sent out with OVS/Openflow rules

[Tonghao Zhang]

On Fri, Jan 15, 2021 at 7:31 AM Eric Li <erictheone at gmail.com> wrote:
>
> Hi All,
>
> We have a setup with br-int and br-tun similar to openstack setup. Using an
> openflow rule to forward a vxlan tunnelled packet to another machine, we
> set the exact destination IP and destination mac under a group rule.
>
> We are seeing ARP requests for the destination IP unexpectedly. I don't
> think OVS is sending those ARP requests, so it would be some linux network
> stack that decided to ARP the destination IP even though the destination
> mac is already in the packet header.
>
> Questions are:
>
> 1. Who trigger this unneeded ARP request?
When OvS tries to send tunnel packets, OvS will use the arp, if there
is no arp, request it.
> 2. Can we disable this behavior?
I add a feature, then OvS can learn arp from linux kernel. In other
words, we disable it ?
http://patchwork.ozlabs.org/project/openvswitch/list/?series=220295
> Thanks,
> Eric
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-- 
Best regards, Tonghao