Lucent Technologies PortMaster, Configuration Manual

Page: 72 / 364

Setting IP Parameters
4-4 PortMaster Configuration Guide
Setting the Subnet Mask
The default subnet mask is 255.255.255.0. If you have divided your network into
subnets, enter the subnet mask that identifies how your network addresses are divided
between the network portion and the host portion.
To set the subnet mask, use the following command:
Command> set Ether0 netmask Ipmask
See Appendix A, “Networking Concepts,” for more information about using subnet
masks.
Setting the Broadcast Address
You can define the IP address used as the local broadcast address. The RIP routing
protocol uses this address to send information to other hosts on the local Ethernet
network. The actual broadcast address is constructed from the IP address of the Ethernet
interface and the netmask. The two valid values are
high , where the host part of the
address is all 1s (such as 192.168.1.255) or low , where the host part of the address is all
0s (such as 192.168.1.0). The PortMaster default is low . The standard for hosts is to
broadcast high, but some hosts still use the low broadcast address, including hosts
running SunOS 4.
x (Solaris 1. x ) and earlier.
The broadcast address you set for the Ethernet interface on the PortMaster must match
the broadcast address set for other hosts on your local Ethernet segment.
To set the broadcast address, use the following command:
Command> set Ether0 broadcast high | low
Enabling or Disabling IP Traffic
IP traffic is sent and received through the PortMaster Ethernet interface. IP is enabled by
default on PortMaster Ethernet ports. If the setting has been changed, you must enable
IP on the Ethernet interface of all PortMaster products attached directly to a local
Ethernet. Disable IP traffic on this port only if the PortMaster is not attached to a local
Ethernet network.