More info
As a sidenote, what port monitoring s/w are you using?
This is also for a response to Stanley.
The software is Packet Sniffer.
http://packet-sniffer.net/
I also use the freeware edition of packet monitor:
http://www.windows7download.com/win7-packet-monitor-free-edition/gonucnco.html
Also, I use my router logs a lot. Here is a snip from just a few minutes of being here just to post this reply. The IP address of the attacking host changes on the fly more often than this log capture, almost as if other valid computers are being used by the attacker to "sniff" me out. Every time I try to reverse lookup one of these IP addresses, they are invalid, or the information does me no good because they are most likely DHCP assignments to nodes on a network somewhere and will change on a variable timetable or have been routed through a DNS server. That makes it nearly impossible to determine the actual source. There is no way you are going to track this back the the originator. It's just not going to happen.
[INFO] Fri Mar 02 13:37:38 2012 Blocked incoming TCP connection request from 192.168.202.99:51470 to 192.168.202.164:80
[INFO] Fri Mar 02 13:37:35 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:36:59 2012 Blocked incoming UDP packet from 192.168.202.99:52448 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:36:50 2012 Blocked incoming TCP connection request from 192.168.202.99:51405 to 192.168.202.164:445
[INFO] Fri Mar 02 13:36:47 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:36:41 2012 Blocked incoming UDP packet from 192.168.202.99:52387 to 192.168.202.164:137
[INFO] Fri Mar 02 13:36:35 2012 Blocked incoming TCP connection request from 192.168.202.99:51343 to 192.168.202.164:80
[INFO] Fri Mar 02 13:36:32 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:35:57 2012 Blocked incoming UDP packet from 192.168.202.99:60978 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:35:46 2012 Blocked incoming TCP connection request from 192.168.202.99:51278 to 192.168.202.164:445
[INFO] Fri Mar 02 13:35:43 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:35:37 2012 Blocked incoming UDP packet from 192.168.202.99:60917 to 192.168.202.164:137
[INFO] Fri Mar 02 13:35:31 2012 Blocked incoming TCP connection request from 192.168.202.99:51216 to 192.168.202.164:80
[INFO] Fri Mar 02 13:35:28 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:34:52 2012 Blocked incoming UDP packet from 192.168.202.99:56715 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:34:44 2012 Blocked incoming TCP connection request from 192.168.202.99:51151 to 192.168.202.164:445
[INFO] Fri Mar 02 13:34:41 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:34:34 2012 Blocked incoming UDP packet from 192.168.202.99:56654 to 192.168.202.164:137
[INFO] Fri Mar 02 13:34:31 2012 Blocked incoming TCP connection request from 192.168.202.99:51089 to 192.168.202.164:80
[INFO] Fri Mar 02 13:34:28 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:33:53 2012 Blocked incoming UDP packet from 192.168.202.99:64033 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:33:44 2012 Blocked incoming TCP connection request from 192.168.202.99:51024 to 192.168.202.164:445
[INFO] Fri Mar 02 13:33:41 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:33:35 2012 Blocked incoming UDP packet from 192.168.202.99:63972 to 192.168.202.164:137
[INFO] Fri Mar 02 13:33:32 2012 Blocked incoming TCP connection request from 192.168.202.99:50962 to 192.168.202.164:80
[INFO] Fri Mar 02 13:33:29 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:32:53 2012 Blocked incoming UDP packet from 192.168.202.99:53681 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:32:44 2012 Blocked incoming TCP connection request from 192.168.202.99:50896 to 192.168.202.164:445
[INFO] Fri Mar 02 13:32:41 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:32:35 2012 Blocked incoming UDP packet from 192.168.202.99:53620 to 192.168.202.164:137
[INFO] Fri Mar 02 13:32:07 2012 Blocked incoming TCP connection request from 192.168.202.99:50830 to 192.168.202.164:80
[INFO] Fri Mar 02 13:32:04 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:31:29 2012 Blocked incoming UDP packet from 192.168.202.99:62943 to 192.168.202.164:1900
[INFO] Fri Mar 02 13:31:20 2012 Blocked incoming TCP connection request from 192.168.202.99:50729 to 192.168.202.164:445
[INFO] Fri Mar 02 13:31:17 2012 Above message repeated 1 times
[INFO] Fri Mar 02 13:31:11 2012 Blocked incoming UDP packet from 192.168.202.99:57250 to 192.168.202.164:137
[INFO] Fri Mar 02 13:30:44 2012 Blocked incoming TCP connection request from 192.168.202.99:50667 to 192.168.202.164:80
Kevin