[ 1195.533029][T10984] Could not find device with ifindex 2000 in netnsfd 11
[ 1195.533747][T10984] Could not find netns with fd: 2000
[ 1195.534319][T10984] Cannot link a netdevsim to itself
[ 1195.535029][T10984] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).