[ 1080.706650][T11103] Could not find device with ifindex 2000 in netnsfd 11
[ 1080.707310][T11103] Could not find netns with fd: 2000
[ 1080.707850][T11103] Cannot link a netdevsim to itself
[ 1080.708545][T11103] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).