[ 1106.378973][T11261] Could not find device with ifindex 2000 in netnsfd 11
[ 1106.379691][T11261] Could not find netns with fd: 2000
[ 1106.380279][T11261] Cannot link a netdevsim to itself
[ 1106.380940][T11261] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).