[ 1218.104646][T11122] Could not find device with ifindex 2000 in netnsfd 11
[ 1218.105356][T11122] Could not find netns with fd: 2000
[ 1218.106255][T11122] Cannot link a netdevsim to itself
[ 1218.106918][T11122] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).