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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-600. 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-600 with the following configuration would discard frames received on its Wireless radio with a
UDP destination port number of 137, effectively blocking NETBIOS Name Service packets.
Protocol Type
Destination
(TCP/UDP)
Port Number
UDP
137
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.
Figure 4-13 Adding a New TCP/UDP Port Filter Entry
3. In the TCP/UDP Port Filter Table
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
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.
1 2 7 (
1 2 7 (
1 2 7 (
1 2 7 (
Filters are enabled by default. Packets that the AP-600 receives on the specified interface(s) with the specified
TCP/UDP destination port, are discarded.
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 Name
Interface
NETBIOS
Wireless
Name Service
enter the Protocol Names to filter.
,
for a list of assigned port numbers and their descriptions.
Advanced Configuration
Status
(Enable/Disable)
Enable
54
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