[ 1228.773347][T11129] Could not find device with ifindex 2000 in netnsfd 11
[ 1228.774111][T11129] Could not find netns with fd: 2000
[ 1228.774657][T11129] Cannot link a netdevsim to itself
[ 1228.775374][T11129] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).