[ 1236.236616][T10985] Could not find device with ifindex 2000 in netnsfd 11
[ 1236.237371][T10985] Could not find netns with fd: 2000
[ 1236.238258][T10985] Cannot link a netdevsim to itself
[ 1236.239009][T10985] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).