[ 1217.518160][T11110] Could not find device with ifindex 2000 in netnsfd 11
[ 1217.519287][T11110] Could not find netns with fd: 2000
[ 1217.520568][T11110] Cannot link a netdevsim to itself
[ 1217.521583][T11110] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).