[ 1122.144774][T11109] Could not find device with ifindex 2000 in netnsfd 11
[ 1122.145867][T11109] Could not find netns with fd: 2000
[ 1122.146746][T11109] Cannot link a netdevsim to itself
[ 1122.148114][T11109] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).