[ 1105.111783][T11236] Could not find device with ifindex 2000 in netnsfd 11
[ 1105.112461][T11236] Could not find netns with fd: 2000
[ 1105.112987][T11236] Cannot link a netdevsim to itself
[ 1105.113623][T11236] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).