[ 1115.757540][T11239] Could not find device with ifindex 2000 in netnsfd 11
[ 1115.758326][T11239] Could not find netns with fd: 2000
[ 1115.758938][T11239] Cannot link a netdevsim to itself
[ 1115.759717][T11239] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).