[ 1108.162528][T11285] Could not find device with ifindex 2000 in netnsfd 11
[ 1108.163310][T11285] Could not find netns with fd: 2000
[ 1108.163914][T11285] Cannot link a netdevsim to itself
[ 1108.164630][T11285] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).