[ 1110.608205][T11286] Could not find device with ifindex 2000 in netnsfd 11
[ 1110.609001][T11286] Could not find netns with fd: 2000
[ 1110.609628][T11286] Cannot link a netdevsim to itself
[ 1110.610439][T11286] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).