[ 1085.163643][T11091] Could not find device with ifindex 2000 in netnsfd 11
[ 1085.164412][T11091] Could not find netns with fd: 2000
[ 1085.165067][T11091] Cannot link a netdevsim to itself
[ 1085.165758][T11091] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).