[ 1083.382886][T11277] Could not find device with ifindex 2000 in netnsfd 11
[ 1083.383611][T11277] Could not find netns with fd: 2000
[ 1083.384167][T11277] Cannot link a netdevsim to itself
[ 1083.385089][T11277] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).