Re: IPMI doesn't work...

From: Jeff Behl (jbehl_at_fastclick.com)
Date: 03/15/05

  • Next message: Marc G. Fournier: "Re[2]: High ping latency using two ethernet under FreeBSD 4.11 ..."
    Date: Tue, 15 Mar 2005 10:10:33 -0800
    To: Julian Elischer <julian@elischer.org>
    
    

    Julian Elischer wrote:

    >
    >
    > Jung-uk Kim wrote:
    >
    >> On Tuesday 15 March 2005 01:14 am, Jeff Behl wrote:
    >>
    >>
    >>> Julian Elischer wrote:
    >>>
    >>>
    >>>> Jeff wrote:
    >>>>
    >>>>
    >>>>> I'm not sure what you mean by in band. The IP address of the
    >>>>> 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...
    >>>>>
    >>>>
    >>>> you have to assign it the same address!
    >>>>
    >>>
    >>> that's not the way it's supposed to work, afaik. it'd be silly to
    >>> 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.
    >

    we've been assigning private addresses to the BMCs making them only
    reachable via a local admin host...
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