[ 1085.027534][T11092] Could not find device with ifindex 2000 in netnsfd 11
[ 1085.028298][T11092] Could not find netns with fd: 2000
[ 1085.028951][T11092] Cannot link a netdevsim to itself
[ 1085.029670][T11092] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).