[ 1088.131010][T10975] Could not find device with ifindex 2000 in netnsfd 11
[ 1088.131824][T10975] Could not find netns with fd: 2000
[ 1088.132472][T10975] Cannot link a netdevsim to itself
[ 1088.133212][T10975] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).