3Com 3C780 User Guide - Page 91

Netmask, Broadcast Address, Default Gateway Address

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4-4 Setting Up the Hub NOTE: In this manual, the address format used (three digits in each octet) is assumed to be decimal representation. If you prefer hexadecimal representation, the address format would be 0x12.0x34.0x56.0x78. The "0x" indicates that the subsequent digits represent hexadecimal values. Netmask The netmask, also known as the subnet mask, is used when multiple physical networks share the same IP address. The bits in the mask determine those bits of the IP address that specify various subnetworks. The mask is determined locally. Broadcast Address The broadcast address is a special group address. It denotes all stations on the network, and all the bits are set to one. For example, if you entered 128.45.255.255, the message would be broadcast to all IP hosts on network 128.45. Default Gateway Address The default gateway address is the Internet address of the gateway used when there are multiple IP networks. The default gateway address is administered locally, usually by an MIS department. To set the default gateway address, enter the set gateway command followed by the default address. If you omit the address, this message appears: Usage: set gateway address where address is the IP default gateway address e.g. set gateway 128.45.76.10

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4-4
Setting Up the Hub
NOTE:
In this manual, the address format used (three digits in each octet) is
assumed to be decimal representation.
If you prefer hexadecimal
representation, the address format would be 0x12.0x34.0x56.0x78.
The “0x”
indicates that the subsequent digits represent hexadecimal values.
Netmask
The netmask, also known as the subnet mask, is used when multiple physical
networks share the same IP address.
The bits in the mask determine those bits
of the IP address that specify various subnetworks.
The mask is determined
locally.
Broadcast Address
The broadcast address is a special group address.
It denotes all stations on the
network, and all the bits are set to one.
For example, if you entered
128.45.255.255, the message would be broadcast to all IP hosts on network
128.45.
Default Gateway Address
The default gateway address is the Internet address of the gateway used when
there are multiple IP networks.
The default gateway address is administered
locally, usually by an MIS department.
To set the default gateway address, enter the
set gateway
command followed by
the default address.
If you omit the address, this message appears:
Usage:
set gateway address
where address is the IP default gateway address
e.g. set gateway 128.45.76.10