[ 1019.781050][T12577] netdevsim netdevsim318 eni318np1: renamed from eth0 [ 1019.882883][T12646] netdevsim netdevsim727 eni727np1: renamed from eth1 [ 1021.760955][T12723] Could not find device with ifindex 2000 in netnsfd 11 [ 1021.762047][T12723] Could not find netns with fd: 2000 [ 1021.762851][T12723] Cannot link a netdevsim to itself [ 1021.763809][T12723] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).