[ 1228.348451][T11141] Could not find device with ifindex 2000 in netnsfd 11
[ 1228.349582][T11141] Could not find netns with fd: 2000
[ 1228.350450][T11141] Cannot link a netdevsim to itself
[ 1228.351520][T11141] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).