[ 1094.249033][T10964] Could not find device with ifindex 2000 in netnsfd 11
[ 1094.249706][T10964] Could not find netns with fd: 2000
[ 1094.250276][T10964] Cannot link a netdevsim to itself
[ 1094.251605][T10964] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).