[ 1103.429798][T11094] Could not find device with ifindex 2000 in netnsfd 11
[ 1103.430505][T11094] Could not find netns with fd: 2000
[ 1103.431046][T11094] Cannot link a netdevsim to itself
[ 1103.431681][T11094] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).