Block Yahoo Messenger, AOL, MSN and ICQ using IPTABLES

If you’re a network administrator and you’re using Linux on your servers, you can stop the rest of the users from using IM applications by blocking their access to the most-used IM protocols:
ICQ and AOL:
# iptables -A FORWARD –dport 5190 -j DROP
# iptables -A FORWARD -d -j DROP

# iptables -A FORWARD -p TCP –dport 1863 -j DROP
# iptables -A FORWARD -d -j DROP
Yahoo Messenger:
# iptables -A FORWARD -p TCP –dport 5000:5010 -j REJECT
# iptables -A FORWARD -d -j REJECT
# iptables -A FORWARD -b -j REJECT

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Anonymous said...

What a great resource!

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