udp 0 0 239.255.255.250:1900 0.0.0.0:* 8204/opera
udp 0 0 192.168.0.2:55963 0.0.0.0:* 8204/opera

http://www.dslreports.com/forum/r23406383-Opera-1010-keeps-opening-ICF-p...
http://www.opera.com/support/mastering/sysadmin/