Cisco 7604 Configuration Guide - Page 301
IP Addresses Used for Access, Lists When You Use NAT
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Chapter 15 Permitting or Denying Network Access Inbound and Outbound Access List Overview Then, if you want to allow only certain hosts on the inside networks to access a web server on the outside network, you can create a more restrictive access list that allows only the specified hosts and apply it to the outbound direction of the outside interface (see Figure 15-1). See the "IP Addresses Used for Access Lists When You Use NAT" section on page 13-3 for information about NAT and IP addresses. The outbound access list prevents any other hosts from reaching the outside network. Figure 15-2 Outbound Access List Web Server: 209.165.200.225 FWSM Outside ACL Outbound Permit HTTP from 209.165.201.4, 209.165.201.6, and 209.165.201.8 to 209.165.200.225 Deny all others Inside ACL Inbound Permit from any to any HR ACL Inbound Permit from any to any Eng ACL Inbound Permit from any to any 132944 10.1.1.14 209.165.201.4 Static NAT 10.1.2.67 209.165.201.6 Static NAT 10.1.3.34 209.165.201.8 Static NAT See the following commands for this example: hostname(config)# access-list INSIDE extended permit ip any any hostname(config)# access-group INSIDE in interface inside hostname(config)# access-list HR extended permit ip any any hostname(config)# access-group HR in interface hr hostname(config)# access-list ENG extended permit ip any any hostname(config)# access-group ENG in interface eng hostname(config)# access-list OUTSIDE extended permit tcp host 209.165.201.4 host 209.165.200.225 eq www hostname(config)# access-list OUTSIDE extended permit tcp host 209.165.201.6 host 209.165.200.225 eq www hostname(config)# access-list OUTSIDE extended permit tcp host 209.165.201.8 host 209.165.200.225 eq www hostname(config)# access-group OUTSIDE out interface outside OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 15-3
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