[ 1237.185593][T10970] Could not find device with ifindex 2000 in netnsfd 11
[ 1237.186700][T10970] Could not find netns with fd: 2000
[ 1237.187622][T10970] Cannot link a netdevsim to itself
[ 1237.188826][T10970] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).