We CAN have 2 Ethernet interfaces with different IP addresses on the same
subnet. It's NOT impossible at all. Nothing prevents this.
BUT...
What's the added value? In one of the companies I've been working for, some
years ago, we had servers configured that way.
Guess what? It didn't bring any added value. Why? Because of the technology at
that time : old servers, shared Ethernet,...
Let's have a look at the technology.
Outgoing frames will just use one interface. They will not be sent twice on the
network. So, no added value.
Incoming frames will depend on the kind of network : shared or switched
Ethernet.
Shared : one frame can travel on the network at a time. So, no added value.
Switched : OK, 2 frames can simultaneously reach the 2 interfaces. So, the
added value will depend on the server...
Old technology : old server, old processor, old software : no ability to handle
such traffic. So, no added value.
New technology : new server, new processor, new software : OK, it will be able
to handle such traffic.
In conclusion : nowadays, it can bring some added value to use 2 interfaces on
a big strong multi-processor server in a switched fast Ethernet environment.
Hope this answers your question.
E.T.
P.S.: in such a case, DISABLE routing between the 2 interfaces, and do NOT
install any routing protocol (RIP,...).
-----Original Message-----
From: EXT-Faycal(_dot_)Hadjiat(_at_)nokia(_dot_)com
[mailto:EXT-Faycal(_dot_)Hadjiat(_at_)nokia(_dot_)com]
Hi all,
I search why we can't have two ethernet interfaces(with different IP address
of course) on the same subnet?
I know it's impossible but why?
Thank you.
BR, Fayçal