User`s guide

Chapter 2

Headquarters conﬁguration

This chapter provides detailed description on conﬁguration of the local network and setup of

WinRoute in company headquarters. The same guidance can also be followed for conﬁguration

of the network in branch oﬃces (only the IP subnet must be diﬀerent).

For purposes of this example, it is supposed that an Active Directory domain company.com is

created in the headquarters’ LAN and all hosts in the network are included in this domain.

2.1 Selection of IP addresses for LAN

In our example, we will focus on private networks connected to the Internet through a single

public IP address. Under such circumstances, the local network will be “hidden” behind this

IP address entirely.

Local networks which do not belong to the Internet (so called private networks) use reserved

special ranges of IP addresses. These addresses must not exist in the Internet (Internet routers

are usually set in order to drop all packets that include these addresses).

The following IP ranges are reserved for private networks:

1. 10.x.x.x, network mask 255.0.0.0

2. 172.16.x.x, network mask 255.240.0.0

3. 192.168.x.x, network mask 255.255.0.0

Warning

Do not use other IP addresses in private networks, otherwise some web pages (those networks

that have the same IP addresses) might be unavailable!

For the headquarters’ LAN, the private addresses 192.168.1.x with subnet mask

255.255.255.0 (IP subnet 192.168.1.0) will be used whereas IP addresses10.1.1.x with

subnet mask 255.255.255.0 (IP subnet 10.1.1.0) will be used for the ﬁlial’s LAN.

Setting IP addresses in an example network

The following methods can be used to assign IP addresses to local hosts:

• The 192.168.1.2 static IP address will be assigned to the domain server / FTP server

(its IP address must not be changed, otherwise mapping from the Internet will not

work).

• A Static IP address will be assigned to the network printer by the DHCP server (DHCP

lease). Printing machines cannot have dynamic IP addresses, otherwise they would be

unavailable from clients if the IP changes.