Problems with two interfaces on the same subnet?

[Fleuriot Damien]

On Feb 12, 2013, at 7:06 PM, Ivan Voras <ivoras at freebsd.org> wrote:

> On 12/02/2013 18:57, Ivan Voras wrote:
>> On 12/02/2013 18:52, Freddie Cash wrote:
>>> Any reason you can't just use lagg(4) in one of the non-LACP modes?  That's
>>> bascially designed to do exactly what you want.
>> 
>> No particular reason, I'm just not familiar enough with it. Will e.g.
>> the "loadbalance" mode "just work" ? Should I expect any problems?
> 
> Actually, I know next to nothing about link aggregation. How do ARP
> requests get solved? Would an attached L3-aware switch see the same IP
> address on two ports? Since "loadbalance" chooses ports based on a hash,
> it will probably start dropping 50% of the outgoing traffic if one of
> the two links dies?
> 
> 


You need a switch that can work with etherchannels (cisco , laggproto fec on your box) or LACP.

Otherwise I assume your switch is going to get very confused about the MAC address for your IP moving around from port to port.
Very *very* confused.