[ 1193.031816][T10981] Could not find device with ifindex 2000 in netnsfd 11
[ 1193.032521][T10981] Could not find netns with fd: 2000
[ 1193.033114][T10981] Cannot link a netdevsim to itself
[ 1193.033807][T10981] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).