Netgear GS748Tv4 GS748Tv4 Software Administration Manual - Page 250

GS748T Smart Switch Software Administration Manual Access Control Lists (ACLs) ACLs ensure that only authorized users have access to specific resources while blocking off any unwarranted attempts to reach network resources. ACLs are used to provide traffic flow control, restrict contents of routing updates, decide which types of traffic are forwarded or blocked, and provide security for the network. ACLs are normally used in firewall routers that are positioned between the internal network and an external network, such as the Internet. They can also be used on a router positioned between two parts of the network to control the traffic entering or exiting a specific part of the internal network. The added packet processing required by the ACL feature does not affect switch performance. That is, ACL processing occurs at wire speed. Access lists are a sequential collection of permit and deny conditions. This collection of conditions, known as the filtering criteria, is applied to each packet that is processed by the switch or the router. The forwarding or dropping of a packet is based on whether or not the packet matches the specified criteria. Traffic filtering requires the following two basic steps: 1. Create an access list definition. The access list definition includes rules that specify whether traffic matching the criteria is forwarded normally or discarded. Additionally, you can assign traffic that matches the criteria to a particular queue or redirect the traffic to a particular port. A default deny all rule is the last rule of every list. 2. Apply the access list to an interface in the inbound direction. The GS748T Smart Switch allows ACLs to be bound to physical ports and LAGs.The switch software supports MAC ACLs and IP ACLs. MAC ACL Example Configuration The following example shows how to create a MAC-based ACL that permits Ethernet traffic from the Sales department on specified ports and denies all other traffic on those ports. 1. From the MAC ACL screen, create an ACL with the name Sales_ACL for the Sales department of your network (See MAC ACL on page 182). By default, this ACL will be bound on the inbound direction, which means the switch will examine traffic as it enters the port. 2. From the MAC Rules screen, create a rule for the Sales_ACL with the following settings: • ID: 1 • Action: Permit • Assign Queue: 0 • Match Every: False • CoS: 0 • Destination MAC: 01:02:1A:BC:DE:EF 250 | Appendix B: Configuration Examples