Motorola WS2000 System Reference Manual page 37

• Specify a Name to identify the new access rule. For example, this could be the name of a particular
application.
• Select a transport type from the
Transport Description
ALL This selection designates all of the protocols displayed in the table's pull-down menu, as described
below.
TCP Transmission Control Protocol (TCP) is a set of rules used with Internet Protocol (IP) to send data as
message units over the Internet. While IP handles the actual delivery of data, TCP keeps track of
individual units of data called packets. Messages are divided into packets for efficient routing
through the Internet.
UDP User Datagram Protocol (UDP) is mostly used for broadcasting data over the Internet. Like TCP, UDP
runs on top of Internet Protocol (IP) networks. Unlike TCP/IP, UDP/IP provides very few error
recovery services and methods. UDP offers a way to directly connect, and then send and receive
datagrams over an IP network.
ICMP Internet Control Message Protocol (ICMP) is tightly integrated with IP. ICMP messages, delivered
in IP packets, are used for out-of-band messages related to network operation. Because ICMP uses
IP, ICMP packet delivery is unreliable. Hosts cannot count on receiving ICMP packets for a network
problem.
AH Authentication Header (AH) is one of the two key components of IP Security Protocol (IPSec). The
other key component is Encapsulating Security Protocol (ESP), described below.
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 (ESP) is one of the two key components of IP Security Protocol
(IPSec). The other key component is Authentication Header (AH), described above.
ESP encrypts the payload of packets, and also provides authentication services. ESP can be used in
transport mode, providing security between two end points. Also, ESP can be used in tunnel mode,
providing security like that of a Virtual Private Network (VPN).
GRE General Routing Encapsulation (GRE) supports VPNs across the Internet. GRE is a mechanism for
encapsulating network layer protocols over any other network layer protocol. Such encapsulation
allows routing of IP packets between private IP networks across an Internet that uses globally
assigned IP addresses.
• Specify port information for the protocol. If the protocol uses only one port, enter the same port
number in the Start Port
use both columns for an entry that has a range of ports.
6. To enable or disable logging for a particular firewall rule, select the appropriate option from the pull-
down menu for the field. When default option is selected, logging will depend on the global
logging field. To enable logging, select enable.
7. Click the Apply button to save changes.
Transport column's pull-down menu. The available transports are:
and End Port columns, or leave the
LAN/Subnet Configuration
End Port column blank. Otherwise,
Enable
3-9