Re: Second Net interface on Qube1
Martin Michlmayr wrote:
First I can ping all ip addresses from a remote pc. eth0 is the
built-in nic on the Qube. If I unplug eth1 I can still ping the
ip 10.32.8.112. If I unplug eth0 all ip addresses loose connection.
I have never seen this behavior before.
Where are the pings originating? I presume that you are logged on to the
qube via eth0, and pinging the eth1 address from there?
If you tried to ping the eth1 address from an external machine, I don't
see any way that this could happen :-)
The exact same thing happens on my Ubuntu desktop machine - the "cable
fault" isn't detected, the interface is not stoped, and local pings to
the interface address continue (because after all, pings on the internal
machine do not travel out onto the cable)
It's possible that unplugging the cable *should* have caused the
interface to stop, but it doesn't appear to be anything specific to the
No, it's a configuration error. I'm not a network expert, but I did
the same once and I was told you cannot have two devices on a machine
which are in the same sub-net (or have the same broadcast address or
I hope you've confused this with something else - having multiple NICs
with same-subnet (e.g. adjacent) IP addresses is normal practice in many
environments. In fact, having multiple aliased interfaces works too
(i.e. eth0, eth0:0, eth0:1 and so on)
The situation could get more confused in environments where it's easy to
rewrite MAC addresses, like with Sun equipment. But otherwise, ARP will
resolve the situation happily.