[ 1193.442766][T10972] Could not find device with ifindex 2000 in netnsfd 11
[ 1193.443464][T10972] Could not find netns with fd: 2000
[ 1193.444107][T10972] Cannot link a netdevsim to itself
[ 1193.444908][T10972] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).