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IP Address Reference Map
If this is the first time you've set up a router, you may be wondering why
the router needs to be configured with so many different IP addresses. An
example of how some logical IP addresses might be associated with physi-
cal nodes is presented below. You will notice a pattern in the logical links
in that 2 nodes with a direct, private connection have the same "subnet"
number. In contrast, a public node such as a DNS might have any subnet
number.
IP addresses
Subnet
Ethernet IP
Gateway
192.168.254.254--
255.255.255.0
Mask
192.168.254.1
255.255.255.0
192.168.254.2
255.255.255.0
192.168.254.3
255.255.255.0
192.168.254.4
255.255.255.0
LAN Workstations
DNS Server(s)
10.10.10.9
(10.10.10.100)
ISP or WAN
Node
172.16.1.254
Default Gateway
WAN IP
Router
-- 172.16.1.85
A "mask" added to the router's Ethernet IP address
can provide a unique, but non-routable IP address
for each device on the LAN. All outgoing traffic
appears to originate from the router's IP address.
Class C Mask
255.255.255.0
Class B Mask 255.255.0.0
Class A Mask 255.0.0.0
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