[  616.696483][ T8103] Could not find device with ifindex 2000 in netnsfd 11
[  616.697208][ T8103] Could not find netns with fd: 2000
[  616.697787][ T8103] netdevsim netdevsim342 eth0: Cannot link a netdevsim to itself
[  616.698796][ T8103] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).