> 
> On 11/03/2018 20:57, Marek Zarychta wrote:
> > On Sun, Mar 11, 2018 at 05:46:52PM +0000, Grzegorz Junka wrote:
> >> 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)?
> >>
> > Please consider bonding all NICs as one bridge(4) interface. Then
> > multiple IPs could be assigned to such interface.
> >
> 
> Many thanks Eugene and Marek for your suggestions. I will now need to 
> decide if I want to fragment the network into subnets or bridge the 
> interfaces.
> GregJ

I believe some of the problem you are experincing is addressed
in this differential:
https://reviews.freebsd.org/D14547

Your original configuration was(is) valid, just not common,
and I have not seen this done in more than a decade, but it
seems as if rstone@ also has someone doing this "multiple IP's
into same subnet on seperate interfaces".


-- 
Rod Grimes                                                 rgri...@freebsd.org
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