[ 1192.678571][T10971] Could not find device with ifindex 2000 in netnsfd 11
[ 1192.679278][T10971] Could not find netns with fd: 2000
[ 1192.679888][T10971] Cannot link a netdevsim to itself
[ 1192.680604][T10971] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).