Suns, Symbolics, Celerities and Reverse ARP

David C. Plummer (DCP@QUABBIN.SCRC.Symbolics.COM)
Wed, 26 Aug 87 17:17 EDT

    Date: Wed, 26 Aug 87 12:08:16 MDT
    From: cpw%sneezy@LANL.GOV (C. Philip Wood)

    Excuse if you already know about this problem. But,
    a recent release of software for the Celerity OS caused
    a big headache here at LANL. The symptom was Suns and
    Symbolics machines could not boot or communicate because
    they could not find out their internet addresses via RARP.

Point of information: The released Symbolics system does not use RARP at
all. (It normally gets it's Internet address from the namespace object
for the host, which it finds from the chaos address, which is specified
in the boot file.) I suspect the Symbolics systems couldn't boot for
some other reason, such as failing to get valid ARP responses from the

    Or, rather, they found out a wrong address, namely
    This tidbit of information was provided by the Celerity RARP

    I give credit to Celerity for finding out about the problem and
    fixing it. However, it took some sluthing with etherfind to figure
    out who the culprit was on our part. And, then finding the offending
    piece of hardware, and then finding someone who would take responsibility
    for it, and then calling up Celerity support. Once we got that far
    the fix was easy. Run ifconfig with the -arp option, and wait for
    the patch tapes in the mail. The came the next day.

    Phil Wood (

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