[ 1199.875598][T10972] Could not find device with ifindex 2000 in netnsfd 11
[ 1199.876273][T10972] Could not find netns with fd: 2000
[ 1199.876808][T10972] Cannot link a netdevsim to itself
[ 1199.877670][T10972] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).