netstat -ib Obytes not incrementing on alias

[Nicolas de Bari Embriz Garcia Rojas]

I have 5 alias on a bce0 interface, IP's belong to another network and
using mask /29

when I run the netstat -ib command I only see the Ibytes but Obytes
don't increment, in contrast a lo1 (cloned interface) does show Ibytes
and Obytes.

Any idea or explanation of why netstat -ib don't show the Obytes for the
aliased IP's on the main nic (bce0)

regards