> traceroute can't get to that IP address, so I'm pretty sure the corporate
> firewall is doing its job.

traceroute failure just means that someone is not passing icmp
traffic.  the only thing you know is icmp traffic won't pass.
here's a dirty trick you can do with plan 9 traceroute:

; ip/traceroute /net/tcp!minooka.coraid.com
trying /net/tcp!12.51.113.6!32767

                       round trip times in µs
                        low      avg     high
                     --------------------------
192.168.0.64            175      243      376 
192.168.1.254           320      386      509 
65.14.248.28          19621    20117    20711 
74.253.143.53         21151    22002    22685 
205.152.99.98         21649    22016    22468 
65.83.238.74          21693    22098    22641 
65.83.238.194         22661    23113    23896 
12.122.140.198        23143    23939    24520 cr2.attga.ip.att.net
12.122.140.45        169904   201516   222315 gar19.attga.ip.att.net
12.87.45.86           26855    27417    28069 
12.51.113.6           26376    26949    27493 

by the way, plan 9 dns query tends to do poorly
with rfc2672-style reverse ips.  it tends to quit on
the cname.

- erik

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