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22 Chapter 2 - IP Routing & Bridging
v Note: The IP Bridging radio button will be grayed out unless bridging has
been turned on globally for the device using the Main Bridging Configuration
Dialog Box (under Global/Bridging) and locally on this interface using the
Bridging: Ethernet Dialog Box (under Ethernet/Bridging).
• If set to IP Off, then any IP packets received on this interface are
discarded.
> IP Address
Every network interface on an IP internetwork must have a unique
IP address
that identifies that interface to other devices on the internetwork. Part of this
address identifies the network segment the router interface is connected to,
and the remainder uniquely identifies the router interface itself.
This address should be entered as four decimal numbers separated by periods
-- for example 198.238.9.1
v Note: The single most common problem encountered in IP networking is
the use of a duplicate IP address. You must carefully track the network
numbers you have assigned to various devices in order to avoid hard-to-diag-
nose problems.
> Network IP Subnet Mask
Most IP networks use “subnetting” in order to subdivide a large network into
smaller logical sub-networks. The subnet mask value is used to tell the router
what part of the IP address identifies the network segment (the “network”
portion), and what part identifies individual interfaces (the “host” portion).
There are three generally used “classes” of subnetted IP networks: A, B and
C. Each class uses a different amount of the IP address for the network and
host portions. These classes may also be further divided by correctly setting
the subnet mask.
If you do not enter a number in the Subnet Mask field, CompatiView will
derive a default value from the IP Address number you entered just above.
This default assumes you want a single subnet for all of the available host
addresses. You must manually set the field if you want to further divide the
address range.
To have CompatiView calculate a default mask, make sure that the Subnet
Mask field is empty, position the cursor in the IP Address field, then just tab
through the Subnet Mask field.
> Network IP Broadcast Address
The router will use this address to send any IP broadcast messages. The stan-
dard broadcast address is all 255’s (hexadecimal FFs) in the host portion of