[ 1248.055667][T10971] Could not find device with ifindex 2000 in netnsfd 11
[ 1248.056819][T10971] Could not find netns with fd: 2000
[ 1248.057768][T10971] Cannot link a netdevsim to itself
[ 1248.058910][T10971] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).