[ 1086.800486][T10967] Could not find device with ifindex 2000 in netnsfd 11
[ 1086.801263][T10967] Could not find netns with fd: 2000
[ 1086.801866][T10967] Cannot link a netdevsim to itself
[ 1086.802738][T10967] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).