  Rahul Nabar rpnabar at gmail.com Mon Oct 26 08:50:26 PDT 2009
On Mon, Oct 26, 2009 at 8:11 AM, Bogdan Costescu <bcostescu at
gmail.com> wrote: > On Sat, Oct 24, 2009 at 11:13 PM, Rahul
Nabar <rpnabar at gmail.com> wrote: >> What surprised me was
that even if I take down my eth interface with a >> ifdown the
IPMI still works. How does it do that ? > The IPMI traffic is IP
(UDP) based and by inspecting the IP header one > can make a
difference between packets with the same MAC and different >
IPs.  Actually, the MAC is different too. I have one NIC but it
responds to two MACs. I guess one is transparent to the OS and
the other is handled by the BMC.  > taken down, it's the Linux
networking stack that doesn't see any > packet coming in,
however the BMC's network stack will still be > active. That's
the whole point of the BMC being a separate entity from > the
main system, so that its functionality remains undisturbed when
> something bad happens to the main system.  I see. So I assume
the BMC's network stack