Avaya Media Gateway G250, Administration Manual

Page: 638 / 840

Configuring policy
638 Administration for the Avaya G250 and Avaya G350 Media Gateways
Network security using access control lists
The primary use of access control lists is to act as a component of network security. You can
use access control lists to determine which applications, networks, and users can access hosts
on your network. Also, you can restrict internal users from accessing specific sites or
applications outside the network. Access control lists can be based on permitting or denying
specific values or groups of IP addresses, protocols, ports, IP fragments, or DSCP values.
Figure 47 illustrates how access control lists are used to control traffic into and out of your
network.
Figure 47: Network security using access control lists