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Can't you set one of your two interfaces as the flannel interface? The vxlan tunnel will be created on that interface

Yes, they are connected using public IPs. But we have a NIC for this IP, as we are using ECMP and balancing the traffic on two NICs

did you use the

--node-external-ip

config flag when creating the cluster?

No

So you are using the publicIP as the

node-ip

?