Configure an Ace to Allow Access to a Web Server with an FQDNĬlient with IP address 10.10.10.2 located in the local area network (LAN) is allowed to access. !- Final result shows allow from the outside interface to the dmz interfaceĪction: allow Scenario 2. !- The configured ACL is permitting this packet to 172.30.0.10 on TCP port 443 Source IP address: Any IP address on the internetĭestination IP address: Translated IP address of the web-server ( 10.105.130.27)ĭestination Port: 80 or 443 ciscoasa# packet-tracer input outside tcp 10.0.50.50 1234 10.105.130.27 443 Ingress interface on which to trace packet: outside Run a packet-tracer command with these fields. Assign the ACL to the outside interface in the inbound direction: access-list OUT-IN extended permit tcp any host 172.30.0.10 eq eq httpsĪccess-group OUT-IN in interface outside Verify The ASA performs proxy-arp for 10.105.130.27 on the 'outside' interface by default when a static NAT rule is configured with a translated IP address that falls in the same subnet as the 'outside' interface IP address 10.105.130.26: object network web-serverĬonfigure this ACE to allow any source IP address on the internet to connect to the web server only on TCP ports 80 and 443. A static one-to-one NAT rule is configured to allow internet users to access the web server with a translated IP address 10.105.130.27. The real IP address of the web server is 172.30.0.10. The client on the internet, located behind the outside interface wants to access a web server hosted behind the DMZ interface listening on TCP ports 80 and 443. Configure an Ace to Allow Access to a Web Server Located behind the DMZ ACLs are made up of one or more Access Control Entries (ACEs). This means that for an ASA version 8.3 and later, traffic is either permitted or denied based on the real IP address of the host instead of the translated IP address. In version 8.3 and later, the ASA untranslates the packet before it checks the ACLs. In the presence of NAT rules, in earlier versions of the ASA (8.2 and earlier), the ASA checks the ACL before untranslating the packet based on the NAT rule that was matched. This behavior can also be overridden with an ACL. By default, traffic that passes from a lower security level interface to a higher security level interface is denied whereas traffic from a higher security level interface to a lower security level interface is allowed. Background InformationĪCLs are used by the ASA to determine if traffic is permitted or denied. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on an ASA software version 8.3 and later. Prerequisites RequirementsĬisco recommends that you have knowledge of ASA. This document describes how to configure an Access Control List (ACL) on the Adaptive Security Appliance (ASA) for various scenarios.
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