[ 1084.389525][T11103] Could not find device with ifindex 2000 in netnsfd 11
[ 1084.390219][T11103] Could not find netns with fd: 2000
[ 1084.391007][T11103] Cannot link a netdevsim to itself
[ 1084.391659][T11103] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).