Jung-uk Kim wrote:
On Tuesday 15 March 2005 01:14 am, Jeff Behl wrote:
Julian Elischer wrote:
Jeff wrote:that's not the way it's supposed to work, afaik. it'd be silly to
I'm not sure what you mean by in band. The IP address of theyou have to assign it the same address!
BMC is assigned via the bios and is different from what the OS
later assigns. With imiptool we can turn on/powercycle/monitor
via the BMC assigned address up until the point where the kernel
loads. Once it does, the BMC no longer responds. This doesn't
happen with the two linux distros we've tried it on. Wtih both,
including SuSE, we can still query/control via the BMC using
ipmitool. It seems to be some sort of driver issue to me. I
find it confusing that the NIC is shared between the BMC and the
OS, but I guess that's just how it's done. Perhaps the bsd
broadcomm driver is simply blocking this somehow...
tie the BMC address and the OS assigned address together. you give
the BMC an ip address via a little program that comes from IBM and
this address is independent of the ip address that whatever os you
use on the system assigns to the nic. the redbook that Jung-uk
sent a link for shows this process if you're interested.
I believe you are correct. If you have the same IP address, the packet reaches host OS and (I think) it must be discarded by OS. IPMI spec. is very verbose but I found very simple explanation here:
I simply have a firewall rule throwing those away.
We have a Class -C full of those machines and if I had to duplicate the addresses I'd need 2.
http://www.ethereal.com/lists/ethereal-dev/200304/msg00233.html
'IPMI messages are encapsulated in Remote Management Control Protocol packets. RMCP is a UDP-based protocol that uses port 623 for remote system control when the system is in a pre-os or os-absent state. RMCP can also use port 664 for secure traffic.'
FYI, IPMI v2.0 defines extended RMCP, so called RMCP+.
like i said earlier, having different ip addresses (the BMC's being
in private address space) works fine with the linux kernel...
Just out of my curiosity, are you using bcm or tg3 driver on Linux?
Thanks,
Jung-uk Kim
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