Incorrect route interface

[Grzegorz Junka]

On 11/03/2018 06:04, Eugene Grosbein wrote:
> 11.03.2018 7:01, Grzegorz Junka wrote:
>
>>> Just do not assign addresses from same network 10.20.0.0/16 to different network interfaces
>>> and you will be fine. Assign them all to right interface:
>>>
>>> ifconfig_em0="inet 10.20.2.14 netmask 255.255.0.0"
>>> ifconfig_em0_alias0="inet 10.20.2.15/32"
>>> ifconfig_igb0_alias0="inet 10.20.2.16/32"
> Interfaces meant to be all equal, last line should be:
>
> ifconfig_em0_alias1="inet 10.20.2.16/32"
>

OK, I see. So this is in case I want many IPs assigned to the same 
interface. What if I want one IP assigned to multiple interfaces (i.e. 
so that the additional igb0-3 effectively work as a 4-port switch)?