Performing Advanced Configuration
SYSTIMAX® AirSPEED™ AP542
User Guide
67
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.
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 1 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:
•
Ethernet
•
Wireless A
•
Ethernet and Wireless A
•
Wireless B
•
Ethernet and Wireless B
•
Wireless A and B
•
All 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
.
Protocol Type
(TCP/UDP)
Destination
Port Number
Protocol Name
Interface
Status
(Enable/Disable)
UDP
137
NETBIOS
Name Service
Ethernet
Enable
