[ 1227.847080][T11115] Could not find device with ifindex 2000 in netnsfd 11
[ 1227.848261][T11115] Could not find netns with fd: 2000
[ 1227.849226][T11115] Cannot link a netdevsim to itself
[ 1227.850777][T11115] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).