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6.4.1 Ethernet Configuration 135
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6.4.1.1 Network Address Parameters
Network address parameters include the IP address, the subnet mask, and the gate-
way address. The network address parameters of the Model 372 can be configured
using one of three methods: DHCP, Auto-IP, or Static-IP. See section 6.4.1.2 for details
on each of these configuration methods.
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IP Address: an IP address is required for a device to communicate using TCP/IP,
which is the protocol generally used for Ethernet devices and the Model 372. The
IP version used by the Model 372 is IPv4. The IPv6 standard is not supported. All
references to the IP protocol from this point forward will be referring to IPv4.
An IP address is a 32-bit logical address used to differentiate devices on a net-
work. It is most often given in dotted decimal notation, such as nnn.nnn.nnn.nnn
where nnn is a decimal number from 0 to 255.
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Subnet Mask: a sub network, or subnet, is a group of devices within a network that
have a common, designated IP address routing prefix. A subnet mask is a 32-bit
“bit mask” that signifies which part of the IP address represents the subnet rout-
ing prefix, and which part represents the device’s address on the subnet. A subnet
mask is most often given in dotted decimal notation, such as nnn.nnn.nnn.nnn
where nnn is a decimal number from 0 to 255. When converted to a binary nota-
tion, the 32-bit subnet mask should consist of a contiguous group of ones, fol-
lowed by a contiguous group of zeros. The ones represent which bits in the IP
address refer to the subnet, and the zeros represent which bits refer to the device
address. For example, the default Static-IP Address of the Model 372 is
192.168.0.12, and the default Static Subnet Mask is 255.255.255.0. Converting
this subnet mask to binary shows that the first 24 bits are ones, and the last 8 bits
are zeros. This means that the first 24 bits of the Static-IP Address (192.168.0)
represent the subnet, and the last 8 bits (12) represent the device.
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Gateway Address: a gateway is a network traffic routing device that is used to route
communication between networks. If a gateway is not used, then devices on a
network can only communicate with other devices on that same network. A
Gateway Address is the IP address of the gateway on a network. Contact the net-
work administrator for the gateway address for your network.
6.4.1.2 Network Address Configuration Methods
The network address parameters of the Model 372 can be configured using one of
three methods: DHCP, Auto-IP, or Static-IP. DHCP and Auto-IP are automatic configu-
ration methods, and Static-IP requires manual configuration. If supported by the
server, DHCP can also be used to automatically configure DNS server addresses, as
well as IP address parameters.
An order of precedence is followed when the Model 372 attempts to acquire IP
address parameters. If enabled, the DHCP method will be used first. If DHCP is dis-
abled, or if the attempt to acquire parameters from the DHCP server fails, the
Model 372 then checks if Auto-IP is enabled. If Auto-IP is enabled, this method will be
used. If disabled, or if this attempt fails, the Static-IP method will be used. If the
Static-IP method fails, the IP address parameters will not be configured and the
Ethernet status will enter an error state. Refer to section 6.4.2.1 if you receive an error
message.
Dynamic Host Configuration Protocol (DHCP): DHCP is a method of automatically configur-
ing the IP address, subnet mask, and gateway of Ethernet devices on a network. This
method provides simple automatic configuration for users connecting to a network
that provides a DHCP server. The network DHCP server will provide an IP address, sub-
net mask, and gateway address. Depending on the DHCP server configuration, it may