On Thu, Aug 06, 2020 at 07:00:15AM +0000, Swarm NameRedacted wrote: > Not sure this applies. There's no NAT since everything is on the same > subnet.
IIUC, packet is received on eth0, you then change the DMAC to SMAC on ingress (among other things) and then packet continues to the bridge. The bridge checks the DMAC and sees that the packet is supposed to be forwarded out of eth0. Since it's also the ingress interface the packet is dropped. To overcome this you need to enable hairpin.
