[ 1081.823837][T11103] Could not find device with ifindex 2000 in netnsfd 11
[ 1081.824574][T11103] Could not find netns with fd: 2000
[ 1081.825216][T11103] Cannot link a netdevsim to itself
[ 1081.825929][T11103] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).