Specifications

Chapter 1 Understanding Networking and IP Addressing
Networking using IP
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
1–25
Figure 1-4 Network architecture showing typical IP configurations.
For information on troubleshooting IP routing and default gateway issues, see the
“ping”, “tracert”, and “ipconfig” subtopics of the “Connectivity Troubleshooting
Utilities” section on page 2-19.
Static and
Dynamic IP
Addressing
Once the administrator has decided exactly what IP addressing scheme to implement,
she has a number of methods of actually getting the IP address (and subnet mask and
default gateway information) onto the host. The simplest method is to configure this
information manually on each machine, using the software provided by the operating
system. However, this is quite time consuming in a network of more than a few hosts.
Company XYZ has a single
network using the private
class C address of
192.168.1.0. The network is
not subnetted.
The router is performing NAT
to translate the address of
Host C to an legitimate
address on the external
network when Host C uses
the Internet.
Company ABC uses the
same private class C
network, but has subnetted it
to provide two networks, one
at each site.
The router is performing NAT
to translate the addresses of
hosts from both private
networks to addresses on
the external network when
the hosts access the
Internet.
Host B IP Configuration
IP Address: 192.168.1.236
Subnet Mask: 255.255.255.128
Gateway: 192.168.1.129
Ethernet
EthernetEthernet
Host A Host B
Host C
Router
Router
Router
Router Configuration
(Ethernet Port)
IP Address: 192.168.1.129
Subnet Mask: 255.255.255.128
Host A IP Configuration
IP Address: 192.168.1.57
Subnet Mask: 255.255.255.128
Gateway: 192.168.1.2
Router Configuration
(Ethernet Port)
IP Address: 192.168.1.2
Subnet Mask: 255.255.255.128
Router Configuration
(Internet Port)
IP Address: 204.253.56.1
Subnet Mask: 255.255.255.0
Router Configuration
(Ethernet Port)
IP Address: 192.168.1.1
Subnet Mask: 255.255.255.0
Router Configuration
(Internet Port)
IP Address: 221.153.56.1
Subnet Mask: 255.255.255.0
Host C IP Configuration
IP Address: 192.168.1.236
Subnet Mask: 255.255.255.0
Gateway: 192.168.1.1
ABC Company
XYZ Company
Internet
Communications link between two sites
Communications
link to the Internet
Communications
link to the Internet