Re: 2 network cards - one cable - both work - why?
From: Randell D. (reply.to.news.group.only_at_and.share.com)
Date: 12/11/03
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Date: Thu, 11 Dec 2003 17:12:14 GMT
"Torsten Kaiser" <NOSPAMPLEASE@pcdweb.de> wrote in message
news:br8s7f$j7l$03$1@news.t-online.com...
> Hello Randell,
>
> Randell D. wrote:
>
> > Correct me if I'm wrong, but since there is only one cable, I should
> > only see one network card.... this is weird...
> >
> > eth0 Link encap:Ethernet HWaddr 00:60:08:65:AD:2C
> > inet addr:192.168.1.2 Bcast:192.168.1.255
Mask:255.255.255.0
> [...]
> >
> > eth1 Link encap:Ethernet HWaddr 00:50:04:4C:56:B8
> > inet addr:192.168.1.3 Bcast:192.168.1.255
Mask:255.255.255.0
>
> I guess the default route of this machine points to the NIC with the
cable.
> When you ping the other device, your machine recognizes that it owns this
> IP as well and answers on the same route it came in.
>
> Usually, two NICs within one machine get assigned two different network
> branches, not only two different IPs within the same network. This is done
> to control the traffic between two networks, e.g. the internet and your
> local network. In this case, behaviour is controlled by the design of
> broadcast adresses and netmasks assigned to the NICs.
>
> HTH
> Torsten Kaiser
>
>
Fair comment... but we're not just talking about pinging out from the box...
I can also ping the server from a windoze and another linux client... I can
ping both lan cards on the server, and both lan cards on the server
respond... There has been no special default routes created on either of the
two clients - when logged on to 192.168.1.32 (a windoze client) and I ping
from there to 192.168.1.2, I get a response from 192.168.1.2... When, from
the same client, I also ping 192.168.1.3, I also get a response... yet only
192.168.1.2 had a cable.... thus... I should *not* have the network card
with 192.168.1.2 respond to ping requests for 192.168.1.2 and 192.168.1.3...
but somehow... they do...
Anyway... to avoid confusion, I have disabled the second network card... I
didn't want to depend on something that shouldn't be if you see what I
mean...
randelld
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