10-34 Remote Operations
Model 6220/6221 Reference Manual
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Manual IP configuration
When connecting the Model 6221 directly to the Ethernet port of a PC or to a hub
that is not part of a larger network, the IP address and subnet mask must be con-
figured manually (the gateway address is not usually relevant for smaller net-
works).
The IP address is a 32-bit identifier consisting of four one-byte (8-bits) sections,
commonly identified in dotted decimal format (i.e., 145.90.120.240). The subnet
mask is a second 32-bit identifier that designates what portion of the IP address
identifies the subnet and what portion identifies the device (i.e., 255.255.255.0). In
this example, 145.90.120 is the network address, and 240 is the device address.
Gateway addresses are typically the device address 1 (for example,
145.90.120.
1
).
Networks are commonly grouped into three classes based on the first byte of the
address shown in
.
Address restrictions
The following IP addresses are reserved; do not assign them to any device (either
interface card or Model 6221).
Do not assign:
•
Any address beginning (first byte) with 0 or 127 (reserved for loopback test)
•
Any address beginning (first byte) with 224 through 255
•
Any address ending (last byte) with 0 or 255.
Table 10-7
Network classes
Class
First byte
Typical
subnet mask
IP address
example
A
1 to 127
255.0.0.0
100.1.1.1
B
128 to 191
255.255.0.0
128.1.1.1
C
191 to 223
255.255.255.0
191.1.1.1
NOTE
Different available IP addresses are required for
each node (this includes each Model 6221 and
each network interface card connected to the in-
struments network).
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