Digital Equipment Digital NetRider, Owner'S Manual

Page: 112 / 536

Configuring the Internet Address and Subnet Mask
7-4 TCP/IP Network Characteristics
Setting an Internet Subnet Mask
The Internet subnet mask is used to partition the host section of an Internet address into
subnets. The default subnet mask depends on the class of the Internet address that you
assigned.
The following table lists these defaults:
Do Not Define the Subnet Mask in the /etc/bootptab File
Although some BOOTP implementations allow you to define a subnet mask using the
/etc/bootptab file, the network access server does not support this feature. For more
information, refer to the network access server software installation documentation for
your load host.
Changing the Subnet Mask
To change the subnet mask, use the CHANGE INTERNET SUBNET MASK
command. The following example shows how to change the subnet mask to
255.255.255.0:
Local> CHANGE INTERNET SUBNET MASK 255.255.255.0
Changing the Subnet Mask to the Default Value
To return the subnet mask to its default value after changing it, do the following:
Supernetted IP Addresses
The DNAS software supports the use of supernetted IP addresses. Supernetting allows
you to configure the access server and its ports with a subnet mask shorter than the
intrinsic subnet mask (for example, 255.255.255.0 for a Class C address). With
Internet Address Class Default Subnet Mask
A 255.0.0.0
B 255.255.0.0
C 255.255.255.0
Step Action
1
Enter the following command:
Local> DEFINE INTERNET SUBNET MASK NONE
2 Reboot the access server.