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Does blocking ip blocks tcp, udp and icmp?

Unanswered Question
Mar 19th, 2003
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I am trying to block access to all messenger from within our network and I have the following questions:


1. Can I block using names of servers for eg login.osacar.aol.com


2.If I block ip traffic , I am sure to block tcp, udp adn icmp. Please confirm


3. Applying access lists to inside interface is enough or should I consider applying them on the outside as well.


Finally are these enough :


for msn

access-list acl_in deny ip any any eq 1863

access-list acl_in deny ip any 64.4.13.0 255.255.255.0


for aol

access-list acl_in deny ip any any eq 5190

and all IP's resolving to IP host login.oscar.aol.com. which I find by doing netstat


for yahoo

block IP's found by doing netstat for cs.yahoo.com, sca.yahoo.com, msg.edit.yahoo.com



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