Advanced Configuration
Advanced
You can configure the following advanced filtering options:
•
Enable Proxy ARP:
Place a check mark in the box provided to allow the Access Point to respond to Address
Resolution Protocol (ARP) requests for wireless clients. When enabled, the AP answers ARP requests for wireless
stations without actually forwarding them to the wireless network. If disabled, the Access Point will bridge ARP
requests for wireless clients to the wireless LAN.
•
Enable IP/ARP Filtering:
Place a check mark in the box provided to allow IP/ARP filtering based on the IP/ARP
Filtering Address and IP Mask. Leave the box unchecked to prevent filtering. If enabled, you should also configure
the IP/ARP Filtering Address and IP/ARP IP Mask.
–
IP/ARP Filtering Address:
Enter the Network filtering IP Address.
–
IP/ARP IP Mask:
Enter the Network Mask IP Address.
The following protocols are listed in the Advanced Filter Table:
•
Deny IPX RIP
•
Deny IPX SAP
•
Deny IPX LSP
•
Deny IP Broadcasts
•
Deny IP Multicasts
The AP can filter these protocols in the wireless-to-Ethernet direction, the Ethernet-to-wireless direction, or in both
directions. Click
Edit
and use the
Status
field to Enable or Disable the filter.
TCP/UDP Port
Port-based filtering enables you to control wireless user access to network services by selectively blocking TCP/UDP
protocols through the AP. A user specifies a Protocol Name, Port Number, Port Type (TCP, UDP, or TCP/UDP), and
filtering interfaces (Wireless only, Ethernet only, all interfaces, or no interfaces) in order to block access to services,
such as Telnet and FTP, and traffic, such as NETBIOS and HTTP.
For example, an AP with the following configuration would discard frames received on its Ethernet interface with a
UDP destination port number of 137, effectively blocking NETBIOS Name Service packets.
Protocol Type
(TCP/UDP)
Destination
Port Number
Protocol Name
Interface
Status
(Enable/Disable)
UDP
137
NETBIOS Name Service
Ethernet
Enable
Adding TCP/UDP Port Filters
1. Place a check mark in the box labeled
Enable TCP/UDP Port Filtering
.
2. Click
Add
under the
TCP/UDP Port Filter Table
heading.
3. In the
TCP/UDP Port Filter Table
,
enter the Protocol Names to filter.
4.
Set the destination Port Number (a value between 0 and 65535) to filter. See the IANA Web site at
http://www.iana.org/assignments/port-numbers
for a list of assigned port numbers and their descriptions.
5. Set the Port Type for the protocol:
TCP
,
UDP
, or both (
TCP/UDP
).
6. Set the
Interface
to filter:
•
Wireless
•
Ethernet
•
All interfaces
•
No interfaces
7. Click
OK
.
Editing TCP/UDP Port Filters
1. Click
Edit
under the
TCP/UDP Port Filter Table
heading.
2. Make any changes to the Protocol Name or Port Number for a specific entry, if necessary.
3. In the row that defines the port, set the
Status
to
Enable
,
Disable
, or
Delete
, as appropriate.
4. Select
OK
.
4-27
