NETGEAR S3300-28X (GS728TX) 24x1GE - Инструкция по эксплуатации - Страница 340

 Configuration Examples

340

S3300 Smart Managed Pro Switch 

Access Control Lists

Access Control Lists (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. 



To filter traffic by using an ACL:

1. 

Create an access list. 

2. 

Configure and add rules to the access list.

A defined ACL 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. 

3. 

Apply the access list to an interface in the inbound direction. 

The switch allows ACLs to be bound to physical ports and LAGs.The switch software 
supports MAC ACLs and IP ACLs. 

MAC ACL Configuration Example

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.

2. 

For more information about how to perform this step, see 

MAC ACL 

on page 274.

By default, this ACL will be bound on the inbound direction, which means the switch will 
examine traffic as it enters the port.

3. 

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