[ 1151.942665][T11509] Could not find device with ifindex 2000 in netnsfd 11
[ 1151.943368][T11509] Could not find netns with fd: 2000
[ 1151.943931][T11509] Cannot link a netdevsim to itself
[ 1151.944593][T11509] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).