
Creating Access Lists and Policies T1/E1 WAN Configuration Guide
12 Copyright © 2005 ADTRAN, Inc. 61200860L1-29.6A
Access List and Access Policy Example
Let’s review the following example to illustrate the ACL and ACP creation process.
For our example, evaluate the incoming and outgoing traffic on the WAN and local Ethernet interfaces.
Use ACLs and ACPs to provide connectivity for traffic between the private LANs (branch site 10.10.4.0
network and corporate HQ 10.25.15.0 network), grant access to the public internet connection for all users
(branch site and corporate HQ), and hide private IP addresses for all traffic transmitted to the public
domain over the PPP connection (to protect the network). The following table outlines our traffic concerns:
Begin by planning the ACL selectors for the traffic received on the connection to the branch office. Use
extended ACLs to use source and destination IP addresses to sort the traffic received from the remote
LANs into two categories – traffic destined for the corporate LAN or traffic destined for the public
Internet. Each category requires an extended ACL to select the appropriate traffic. All traffic destined for
the public Internet requires a many-to-one NAT configuration to hide the private IP addresses and to allow
a single, public IP address for access to the Internet.
Next, plan the ACL selectors for the traffic received on the local network (Ethernet interface). Use
extended ACLs to use source and destination IP addresses to sort the traffic received from the local
network into two categories – traffic destined for the branch office LAN or traffic destined for the public
Internet. Each category requires an extended ACL to select the appropriate traffic. All traffic destined for
the public Internet requires a many-to-one NAT configuration to hide private IP addresses and to allow a
single, public IP address for access to the Internet.
Interface Traffic to Select
Connection to
Branch Office
traffic from remote LAN (10.10.4.0/24) destined for the local LAN (10.25.15.0/24)
traffic from remote LAN (10.10.4.0/24) to the Internet through the PPP interface
Local Network
(Ethernet Interface)
traffic destined for the remote LAN (10.10.4.0/24)
traffic to the Internet through the PPP interface
NetVanta 4305
STATUS
NET 2
WAN
DBU
TD
RD
TD
RD
LNK
LAN 2
NetVanta 4305
STATUS
ACTIVITY
TEST
WIDE SLOT 1
TD
RD
LNK
LAN 1
NET 1
WAN
DBU
TD
RD
NetVanta 4305
STATUS
NET 2
WAN
DBU
TD
RD
TD
RD
LNK
LAN 2
NetVanta 4305
STATUS
ACTIVITY
TEST
WIDE SLOT 1
TD
RD
LNK
LAN 1
NET 1
WAN
DBU
TD
RD
Internet
PPP
10.25.15.0/24
10.10.4.0/24
68.22.15.2/30
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