[ 1079.792034][T11102] Could not find device with ifindex 2000 in netnsfd 11
[ 1079.792825][T11102] Could not find netns with fd: 2000
[ 1079.793544][T11102] Cannot link a netdevsim to itself
[ 1079.794371][T11102] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).