Configuring Access Point Security 6-31
4. Click Apply to save any changes to the Subnet Ac cess screen. Navigating away from the
screen without clicking the Apply button results in all changes to the screens being lost.
5. Click Undo Changes (if necessary) to undo any changes made. Undo Changes reverts the
settings displayed on the Subnet Access screen to the last saved configuration.
6. Click Logout to securely exit the AP-5131 Symbol Access Point applet. A prompt displays
confirming the logout before the applet is closed.
6.10.1.1 Available Protocols
Protocols that are not pre-configured can be specified using the drop down list within the Transport
column within the Subnet Access and Advanced Subnet Access screens. They include:
•ALL - Enables all of the protocol options displayed in the drop-down menu (as described
below).
•TCP - Transmission Control Protocol is a set of rules for sending data as message units over
the Internet. TCP manages individual data packets. Messages are divided into packets for
efficient routing through the Internet.
•UDP - User Datagram Protocol is used for broadcasting data over the Internet. Like TCP, UDP
runs on top of Internet Protocol (IP) networks. Unlike TCP/IP, UDP/IP provides few error
recovery services. UDP offers a way to directly connect, and then send and receive
datagrams over an IP network.
•ICMP - Internet Control Message Protocol is tightly integrated with IP. ICMP messages are
used for out-of-band messages related to network operation. ICMP packet delivery is
unreliable. Hosts cannot count on receiving ICMP packets for a network problem.
•AH - Authentication Header is one of the two key components of IP Security Protocol (IPsec).
The other key component is Encapsulating Security Protocol (ESP).
AH provides authentication, proving the packet sender really is the sender, and the data
really is the data sent. AH can be used in transport mode, providing security between two
end points. Also, AH can be used in tunnel mode, providing security like that of a Virtual
Private Network (VPN).
•ESP - Encapsulating Security Protocol is one of two key components of IP Security Protocol
(IPsec). The other key component is Authentication Header (AH). ESP encrypts the packets
and provides authentication services. ESP can be used in transport mode, providing security
End Port Enter the ending port number for a port range. If the protocol uses
a single port, leave the field blank. A new entry might use Web
Traffic for its name, TCP for its protocol, and 80 for its port number.