Unknown user agent in my logs...

Beginning just after 18:00 this evening, my Apache access log began to show 
hits every few seconds from the same source IP. 
Other than time, all lines appear to be the same... (sample given below).

Hits continued until I blocked the source IP (via iptables). My router shows 
the incoming attempts continue at the same rate (but iptables is dropping 
the packets as they reach that machine).

I'm wondering if anyone has experience with the User Agent shown in these 
log entries. Google hasn't helped me at all (maybe my Google skills are 
lacking...). 

I suspect a hacked machine, especially since they apparently haven't noticed 
I have blocked them; but, I wonder, hacked with what???

--- Begin Sample ---
70.245.143.248 - - [08/Apr/2007:19:40:21 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:27 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:33 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:39 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:45 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:51 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:40:57 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:03 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:09 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:15 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:22 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:28 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:34 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:40 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:46 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:52 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:41:58 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:42:04 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:42:10 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:42:16 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:42:22 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
70.245.143.248 - - [08/Apr/2007:19:42:28 -0500] "GET / HTTP/1.1" 206 
5293 "-" "EZI_HTTP_NETDEV_DISCOVER"
--- End Sample ---

Thanks in advance,
-- 
Clinton E. Troutman
Independent Computer Consultant for Home,
  Home Office, and Small Business in Fort Worth, Texas

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