Duplicate pings

There's a W2K3 host on the network that occasionally (but frequently)
shows up as a dup...

[root@cerberus ~]# ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=0 ttl=128 time=0.140 ms
64 bytes from 10.0.0.2: icmp_seq=0 ttl=128 time=34.6 ms (DUP!)
64 bytes from 10.0.0.2: icmp_seq=1 ttl=128 time=0.108 ms
64 bytes from 10.0.0.2: icmp_seq=1 ttl=128 time=48.2 ms (DUP!)
64 bytes from 10.0.0.2: icmp_seq=2 ttl=128 time=0.103 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=128 time=62.1 ms (DUP!)
64 bytes from 10.0.0.2: icmp_seq=3 ttl=128 time=0.106 ms
64 bytes from 10.0.0.2: icmp_seq=3 ttl=128 time=33.7 ms (DUP!)
64 bytes from 10.0.0.2: icmp_seq=4 ttl=128 time=0.118 ms
64 bytes from 10.0.0.2: icmp_seq=4 ttl=128 time=206 ms (DUP!)

There's only one ARP entry for that IP:

[root@cerberus ~]# arp -a
morpheus (10.0.0.2) at 00:15:C5:E5:FB:E2 [ether] on eth0

I logged on to that host to make sure that there wasn't more than one
interface (physical or logical) configured with that address.
Unfortunately, it's connected to one of those dumbass Dell 2724s, and no
username/password I have works, so I can't attack the switch angle until
I can reconfigure it, or find someone who remembers the correct login.
Any other ideas to try to figure this out?

--
* John Oliver http://www.john-oliver.net/ *
.

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