[ 1196.554348][T10979] Could not find device with ifindex 2000 in netnsfd 11
[ 1196.565233][T10979] Could not find netns with fd: 2000
[ 1196.566212][T10979] Cannot link a netdevsim to itself
[ 1196.567319][T10979] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).