Mikrotik - Block Yahoo Messenger

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/ip firewall layer7-protocol add name=yahoo-messenger regexp=\

"^(ymsg|ypns|yhoo).\?.\?.\?.\?.\?.\?.\?[lwt].*\C0\80"

/ip firewall address-list add address=66.196.0.0/16 list=yahoo-messenger

/ip firewall filter add action=drop chain=forward comment="BLOCK YAHOO MESSENGER" \

src-address-list=yahoo-messenger

add action=drop chain=input comment="BLOCK YAHOO MESSENGER" src-address-list=\

yahoo-messenger

add action=drop chain=forward comment="BLOCK YAHOO MESSENGER" \

layer7-protocol=yahoo-messenger

fonte: http://www.itlearnweb.com