[ 1193.366356][T10976] Could not find device with ifindex 2000 in netnsfd 11
[ 1193.367109][T10976] Could not find netns with fd: 2000
[ 1193.367656][T10976] Cannot link a netdevsim to itself
[ 1193.368348][T10976] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).