Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 39)

Chapter 2 - IP Routing & Bridging 33

• If checked, then you must set an IP Address, Subnet Mask, and Broad-

cast Address (as described below) for this VPN port. The default is

unchecked.

IP Address

If you wish to assign an IP address, it must be unique

. 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, 198.238.9.5

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 device

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, (re)position the cursor in the IP Address field, then just

tab through the Subnet Mask field.

Network IP Broadcast Address

The standard broadcast address is all 255’s (hexadecimal FFs) in the host

portion of the address. A few networks use all zeroes in this field. If you are

unsure which type your network uses, check with your network administrator.

To have CompatiView calculate a default broadcast address, make sure that

the Broadcast Address field is empty, (re)position the cursor in the Subnet

Mask field, then just tab through the Broadcast Address field.

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Compatible-systems 5.4 Manuel d'utilisateur Page 39