One IP for several Interfaces

Sten Carlsen stenc at
Sat Feb 21 11:36:42 UTC 2015

While you are correct in principle, real world experience shows that
some systems work well with this setup.

I was able to change between wired and wireless in the middle of a
download without transfer stopping. I did confirm that both interfaces
had the same IP at the time.

I have no doubt that other systems don't handle this well and as such it
is not a recommended setup.

On 21/02/15 12:15, Алексей Прокопчук wrote:
> 21.02.2015 00:59, John Wobus пишет:
>> But if it's connected twice to the same broadcast
>> domain
> I mean exactly that. Two interfaces in same system can cause IP address
> conflict in this case. If conflict detected, only one interface will up
> finally, and all traffic will go through this one.
> If wired and wireless interfaces connected to same ethernet segment with
> same IP address, and conflict not detected, two identical routes will
> up. System can use only one of routes. And traffic finally will go
> through selected route. So, interface with inactive route will be
> "silent", and will not affect the flow of traffic.
> But, in any case, such a connection is wrong. In general, it is unclear
> what may be necessary to use both interfaces simultaneously.
> Sorry, my English is not very good, maybe I mistaken somewhere. I
> sometimes difficult to properly speak.
> With best regards, Alexey Prokopchuk (AP8686-RIPE)
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> dhcp-users mailing list
> dhcp-users at

Best regards

Sten Carlsen

No improvements come from shouting:


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