system to ensure the user does not "lock"
them out of the system. The first rule allows
any and all ARP frames through the system.
The second rule allows all IPv4 frames with
the destination MAC address of the bridge to
go through. The third rule allows all IPv4 fra-
mes with the source MAC address of the
bridge to go through.
NOTE:
On a windows based machine, to find a MAC
address, at a dos prompt type ipconfig /all.
The apply button will temporarily save this connec-
tion. To make the change permanent you need to
click on Save Settings (at the side of the page). At
the system commands page, click on Save All.
4.6.7 Multicast
Multicasting is a form of limited broadcast. UDP is
used to send datagrams to all hosts that belong to
what is called a "host group." A host group is a set
of zero or more hosts identified by the same desti-
nation IP address. The following statements apply to
host groups.
a.) Anyone can join or leave a host group at will.
b.) There are no restrictions on a host's location.
c.) There are no restrictions on the number of mem-
bers that may belong to a host group.
d.) A host may belong to multiple host groups.
e.) Non-group members may send UDP datagrams
to the host group.
Multicasting is useful when data needs to be sent to
more than one other device. For instance, if one
device is responsible for acquiring data that many
other devices need, then multicasting is a natural
fit. Note that using multicasting as opposed to sen-
ding the same data to individual devices uses less
network bandwidth.
To enable Multicasting, click on Advanced and
under Advanced, select Muliticast. Figure 16 illustra-
tes a typical Multicast configuration.
Figure 16 (Multicast)
The apply button will temporarily save this connec-
tion. To make the change permanent you need to
click on Save Settings (at the side of the page). At
the system commands page, click on Save All.
4.6.8 Static Routing
If the ADSL Router is connected to more than one
network, you may need to set up a static route bet-
ween them. A static route is a pre-defined pathway
that network information must travel to reach a
specific host or network. You can use static routing
to allow different IP domain users to access the
Internet through the ADSL Router.
The New Destination IP is the address of the remote
LAN network or host to which you want to assign a
static route. Enter the IP address of the host for
which you wish to create a static route here. For a
standard Class C IP domain, the network address is
the first three fields of the New Destination IP, while
the last field should be 0. The Subnet Mask identi-
fies which portion of an IP address is the network
portion, and which portion is the host portion. For a
full Class C Subnet, the Subnet Mask is
255.255.255.0. The Gateway IP address should be
the IP address of the gateway device that allows for
contact between the Gateway and the remote net-
work or host. The Hop Count determines the maxi-
mum number of steps between network nodes that
data packets will travel. A node is any device on the
network (such as a router or switch)
To enable Static Routing, from the Home screen,
click Advanced and under Advanced, select Static
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