[ 1096.476781][T10977] Could not find device with ifindex 2000 in netnsfd 11
[ 1096.477575][T10977] Could not find netns with fd: 2000
[ 1096.478183][T10977] Cannot link a netdevsim to itself
[ 1096.478945][T10977] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).