[ 1196.333191][T10986] Could not find device with ifindex 2000 in netnsfd 11
[ 1196.334266][T10986] Could not find netns with fd: 2000
[ 1196.334832][T10986] Cannot link a netdevsim to itself
[ 1196.335517][T10986] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).