[ 1226.772282][T11122] Could not find device with ifindex 2000 in netnsfd 11
[ 1226.773298][T11122] Could not find netns with fd: 2000
[ 1226.774101][T11122] Cannot link a netdevsim to itself
[ 1226.775159][T11122] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).