I have a cisco pix 515 and I have set aside around 80 routable IP addresses for NAT use for all of the desktops going out to the internet I have already set up an access-list for inside traffic going out and I wanted to explicitly set a DENY statement for any outside machine to connect to any machine in that IP range.. I know by default that firewalls are set up to block everything, but a couple of people have had IRC chat clients installed on their machines( to which they deny installing) but I was wondering if there was a "range" statement I could use to block all inbound traffic to those clients?
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