[ 1193.650251][T10980] Could not find device with ifindex 2000 in netnsfd 11
[ 1193.651107][T10980] Could not find netns with fd: 2000
[ 1193.651708][T10980] Cannot link a netdevsim to itself
[ 1193.652862][T10980] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).