[ 1117.888568][T11109] Could not find device with ifindex 2000 in netnsfd 11
[ 1117.889340][T11109] Could not find netns with fd: 2000
[ 1117.890663][T11109] Cannot link a netdevsim to itself
[ 1117.891368][T11109] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).