Lab 8.5.1 Configuring ACLs and Verifying with Console Logging

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Configuring ACLs and Verifying with Console Logging

s.othman3 · Answer

configuring acls and verifying with console logging

acls (access control lists) are network security tools used to control traffic flow on a network interface. they allow or deny traffic based on predefined criteria, such as source and destination ip addresses, protocols, and port numbers. console logging allows you to monitor network activity on a router or switch. when enabled for acls, it records information about packets that match or are denied by the acl rules. this information helps verify if the acl is functioning as intended. here's a breakdown of the process: 1. configuring acls: choose acl type: there are two primary types of acls: standard acls: these filter traffic based on source ip address only. they are simpler to configure but offer less granular control. extended acls: these offer more flexibility by allowing filtering based on source and destination ip addresses, protocols, and port numbers. define the acl: assign a unique number to the acl for identification. create rules: use permit or deny statements to specify traffic allowed or blocked by the acl. 2. applying acls: interface binding: assign the acl to a specific network interface (e.g., ethernet 0/1) to control incoming or outgoing traffic. 3. enabling console logging: use specific commands depending on the router/switch operating system (e.g., "logging permit tcp any any" for cisco ios). this configures the console to log permitted tcp traffic matching any source and destination. 4. verifying acl functionality: generate test traffic that matches or violates the acl rules. monitor console logs for entries related to the acl. analyze the logged information to see if the acl is functioning as intended (permitting or denying traffic as expected). benefits of console logging with acls: provides real-time feedback on acl activity. helps identify potential security breaches or unauthorized access attempts. allows for troubleshooting issues with the acl configuration. here's an example scenario: imagine you want to restrict access to a server on your network (192.168.1.100) from all ip addresses except the network administrator's pc (192.168.1.20).

you would configure an extended acl (for flexibility) and define a rule: "permit tcp 192.168.1.20 22 any" (allowing ssh access from the admin pc). you would then deny all other traffic with a rule: "deny ip any any". bind the acl to the interface connected to the server (incoming traffic). enable console logging for permitted tcp traffic. by monitoring console logs, you can verify that only traffic from the admin pc is accessing the server via ssh. remember: specific commands for configuring acls and console logging vary depending on the network device vendor and operating system. always consult the device documentation for accurate instructions.

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Due Date:	2 June 2024, 20:06
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Lab 8.5.1 Configuring ACLs and Verifying with Console Logging

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