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Re: Stupid Cisco ACL question
From: Jay Ford <jay-ford () uiowa edu>
Date: Thu, 21 Apr 2011 14:20:09 -0500 (CDT)

On Thu, 21 Apr 2011, up () 3 am wrote:
permit tcp any eq 443 any
permit tcp any eq 80 any
deny ip any host 2.2.3.4
permit ip any any

This is applied to an inbound interface(s).  We want anybody outside to be
able to reach ports 80 and 443 of any host on our network, no matter what,
then block ALL other access to select hosts, such as 2.2.3.4, even ICMP.
However, as soon as I apply this rule to the interface, ports 80 and 443
of that host become unreachable.  A telnet to 2.2.3.4 443 gets "Connection
refused" until I tear out the deny ACL above.  I even tried adding udp for
both ports, to no avail.

Your ACL is apply the 80 & 443 as source ports, not destination ports.

You probably want:
   permit tcp any any eq 443
   permit tcp any any eq 80
   deny ip any host 2.2.3.4
   permit ip any any

________________________________________________________________________
Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford () uiowa edu, phone: 319-335-5555, fax: 319-335-2951


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