[ 1101.519475][T11234] Could not find device with ifindex 2000 in netnsfd 11
[ 1101.520207][T11234] Could not find netns with fd: 2000
[ 1101.521017][T11234] Cannot link a netdevsim to itself
[ 1101.521727][T11234] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).