Advanced Subnet Access Settings - Motorola WS2000 - Wireless Switch - Network Management Device System Reference Manual

Transport Description
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
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
logging field. To enable logging, select enable.
7. Click the Apply

3.4 Advanced Subnet Access Settings

There can be situations in which the standard subnet access setting process is not specific enough for the
needs of an organization. Instead, access or firewall rules need to be defined based upon destination and
source IP addresses, transport types, and ports. The Advanced Subnet Access screen allows the
administrator to create more complicated inbound and outbound policies.
Select Network Configuration
screen consists of two areas. The Settings area enables or disables the data found on this screen. The
Firewall Rules area displays the currently defined and active firewall rules. This area will display either the
inbound or outbound rules. The rules are applied in the order that they are listed. The rules at the top of the
list take precedence over the rules lower in the list.
Start Port and End Port
default option is selected, logging will depend on the global
button to save changes.
--> Firewall
columns, or leave the End Port
--> Advanced Subnet Access
3-9
LAN/Subnet Configuration
column blank. Otherwise,
Enable
from the left menu. The