Sample configurations – Alcatel Carrier Internetworking Solutions 1000 ADSL User Manual
Page 55
Table I. Default Netmask
IP Address Class
Default Netmask
A
255.0.0.0
B
255.255.0.0
C
255.255.255.0
S
S
S
a
a
a
m
m
m
p
p
p
l
l
l
e
e
e
C
C
C
o
o
o
n
n
n
f
f
f
i
i
i
g
g
g
u
u
u
r
r
r
a
a
a
t
t
t
i
i
i
o
o
o
n
n
n
s
s
s
S
S
i
i
n
n
g
g
l
l
e
e
P
P
C
C
The modem comes preconfigured with IP address 10.0.0.138. To establish a local
connection between the PC and the modem, configure the IP address of the PC
within the same IP network of the modem, and if subnetting is applied, within the
same IP subnet of the modem. The address must be unique within the network.
It is recommended that the PC is allocated an IP address that falls within one of
the private ranges of the modem or to use an address in the default range of the
modem, for example, 10.0.0.140 (refer to figure 32).
IP Network 10
IP address : 10.0.0.138
(Sub)netmask : 255.255.0.0
Default Gateway : none
IP address : 10.0.0.140
(Sub)netmask : 255.255.0.0
Default Gateway : none
PC
Modem
Figure 32. Example of Single PC Configuration
The modem IP address falls within one of the ranges set aside by IANA for private
IP networks. These ranges are defined in RFC 1918, Address Allocation for Private
Internets. Table J lists the currently defined ranges.