ADTRAN 1000R Series User Manual

Page 396

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Command Reference Guide

Global Configuration Mode Command Set

61200510L1-35E

396

Usage Examples

The following example creates an access list AllowIKE to allow all IKE (UDP Port 500) packets from the
190.72.22.55.0/24 network:

(config)#ip access-list extended AllowIKE

(config-ext-nacl)#permit udp 190.72.22.55.0 0.0.0.255 eq 500 any eq 500

For more details, refer to the ADTRAN OS System Documentation CD or the ADTRAN website
(www.adtran.com) for technical support notes regarding access-list configuration.

Technology Review

Creating access policies and lists to regulate traffic through the routed network is a four-step process:

Step 1:

Enable the security features of the AOS using the ip firewall command.

Step 2:

Create an access control list (using the ip access-list command) to permit or deny specified traffic.
Standard access lists provide pattern matching for source IP addresses only. (Use extended access lists
for more flexible pattern matching.) IP addresses can be expressed in one of three ways:

1. Using the keyword any to match any IP address. For example, entering deny any will effectively shut

down the interface that uses the access list because all traffic will match the any keyword.

2. Using the host <A.B.C.D> to specify a single host address. For example, entering permit host

196.173.22.253 will allow all traffic from the host with an IP address of 196.173.22.253.

3. Using the <A.B.C.D> <wildcard> format to match all IP addresses in a “range.” Wildcard masks work in

reverse logic from subnet mask. Specifying a one in the wildcard mask equates to a “don’t care.” For
example, entering permit 192.168.0.0 0.0.0.255 will permit all traffic from the 192.168.0.0/24 network.

Step 3:

Create an access control policy (using the ip policy-class command) that uses a configured access list.
AOS access policies are used to allow, discard, or manipulate (using NAT) data for each physical interface.
Each ACP consists of a selector (access list) and an action (allow, discard, NAT). When packets are
received on an interface, the configured ACPs are applied to determine whether the data will be processed
or discarded. Possible actions performed by the access policy are as follows:

allow list <access list names>

All packets passed by the access list(s) entered will be allowed to enter the router system.

discard list <access list names>

All packets passed by the access list(s) entered will be dropped from the router system.

allow list <access list names> policy <access policy name>

All packets passed by the access list(s) entered and destined for the interface using the access policy
listed will be permitted to enter the router system. This allows for configurations to permit packets to a
single interface and not the entire system.

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