D-Link DES-3250TG, Command Line Interface Reference Manual

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DES-3250TG Layer 2 Fast Ethernet Switch User’s Guide
275
Access profiles allow you to establish criteria to determine whether the
switch will forward packets based on the information contained in each
packet’s header. These criteria can be specified on a VLAN-by-VLAN
basis.
Creating an access profile is divided into two basic parts. First, an
access profile must be created using the
create access_profile
command. For example, if you want to deny all traffic to the subnet
10.42.73.0 to 10.42.73.255, you must first
create an access profile that
instructs the switch to examine all of the relevant fields of each frame,
and specify
deny :
create access_profile ip source_ip_mask 255.255.255.0 profile_id
1 deny
Here we have created an access profile that will examine the IP field of
each frame received by the switch. Each source IP address the switch
finds will be combined with the
source_ip_mask with a logical AND
operation. The profile_id parameter is used to give the access profile
an identifying number
−
in this case, 1 . The deny parameter instructs
the switch to filter any frames that meet the criteria
−
in this case, when
a logical AND operation between an IP address specified in the next
step and the
ip_source_mask match.
The default for an access profile on the switch is to permit traffic flow. If
you want to restrict traffic, you must use the deny parameter.
Now that an access profile has been created, you must add the criteria
the switch will use to decide if a given frame should be forwarded or
filtered. Here, we want to filter any packets that have an IP source
address between 10.42.73.0 and 10.42.73.255:
config access_profile profile_id 1 add access_id 1 ip source_ip
10.42.73.1
Here we use the profile_id 1 which was specified when the access
profile was created. The add parameter instructs the switch to add the
criteria that follows to the list of rules that are associated with access