I oversee a small network of about 25 PCs. We have a static IP, a
Netopia 3500 series modem/router, and its security log regularly
lists warnings like the two I’ve pasted below. What is meant by “port
scan” and “IP Source Address Spoofing” and are these cause for
concern?
-Thanks-
———
Security alert type : Port Scan
Protocol type : UDP
IP source address : 206.251.233.105
Time at last attempt : Mon Mar 19 00:49:46 2007(UTC)
Number of ports that were scanned: 8
Highest port : 33451
Lowest port : 33444
33444 33445 33446 33447 33448 33449 33450 33451
————
Security alert type : IP Source Address Spoofing
IP source address : 192.168.214.2
IP destination address : 208.254.45.206
Number of attempts : 5
Time at last attempt : Mon Mar 19 00:55:50 2007(UTC)
IP Interface : ENET (10/100BT-LAN
————-