Cabletron Systems SmartSwitch manual Applying ACLs to Services, Using ACLs as Profiles

Chapter 17: Access Control List Configuration Guide

interface. Nonetheless, for performance reasons, whenever possible, you should create and apply an ACL to the inbound interface.

To apply an ACL to an interface, enter the following command in Configure mode:

Apply ACL to an interface.

acl <name> apply interface <interface name>

inputoutput [logging onoffdeny- onlypermit-only][policy localexternal]

Applying ACLs to Services

ACLs can also be created to permit or deny access to system services provided by the SSR; for example, HTTP or Telnet servers. This type of ACL is known as a Service ACL. By definition, a Service ACL is for controlling inbound packets to a service on the router. For example, you can grant Telnet server access from a few specific hosts or deny Web server access from a particular subnet. It is true that you can do the same thing with ordinary ACLs and apply them to all interfaces. However, the Service ACL is created specifically to control access to some of the services on the SSR. As a result, only inbound traffic to the SSR is checked. Destination address and port information is ignored; therefore if you are defining a Service ACL, you do not need to specify destination information.

Note: If a service does not have an ACL applied, that service is accessible to everyone. To control access to a service, an ACL must be used.

To apply an ACL to a service, enter the following command in Configure mode:

Apply ACL to a service.

acl <name> apply service <service name>

[logging [onoff]]

Using ACLs as Profiles

You can use the acl command to define a profile. A profile specifies the criteria that addresses, flows, hosts, or packets must meet to be relevant to certain SSR features. Once you have defined an ACL profile, you can use the profile with the configuration command for that feature. For example, the Network Address Translation (NAT) feature on the SSR allows you to create address pools for dynamic bindings. You use ACL profiles to represent the appropriate pools of IP addresses.

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