[ 1087.414059][T11104] Could not find device with ifindex 2000 in netnsfd 11
[ 1087.414692][T11104] Could not find netns with fd: 2000
[ 1087.415499][T11104] Cannot link a netdevsim to itself
[ 1087.416429][T11104] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).