Reviewing And Setting The Subnet Mask And Default Gateway - Fluke Data Acquisition System/Data Logging System 2680A Getting Started Manual

2680A/2686A
Getting Started Guide

Reviewing and Setting the Subnet Mask and Default Gateway

If communication between the host computer and the 2680 Series passes through a
router or gateway, you must set the subnet mask and default gateway address on
both the host computer and the device. Get this information from your network
administrator.
Perform the procedure in Table 7 to review or set the device network gateway
parameters. The network gateway parameters include turning the default gateway
feature on or off, setting a subnet mask, and setting an IP address for the gateway
attached to the local network.
Set the IP address of the device before setting the gateway
parameters. The 268XA device checks the gateway IP address for
validity by using the device IP address.
Default Gateway Parameters If the 268XA device and host PC are on
different subnets and must communicate through a gateway (router), turn the
default gateway feature ON and enter the subnet mask and IP address of the
gateway, as supplied by your network administrator. If you do not require a
gateway, turn the default gateway feature OFF.
Subnet Mask The subnet mask is a 32 bit binary number expressed as four
3 digit segments, like an IP address. The subnet mask, when masked with the
device IP address, determines what the network number is. For example, if the
IP address is 129.196.180.93 and the subnet mask is 255.255.255.0, the
network number is 129.196.180.0.
The subnet mask contains a consecutive set of bits, starting at the highest order
bit, forming a binary mask value. For example, 255.255.0.0 (binary value
FFFF0000 hex) is a valid mask, but 255.255.10.0 (binary value FFFF0A00
hex) is not a valid mask, because the bits are not consecutive. 0.255.255.0
(binary value 00FFFF00 hex) is also not a valid mask, because the bits do not
begin at the highest order bit.
The subnet mask must also contain a minimum number of bits depending on
the class of the device IP address. The minimum number of bits for a class A
address is 255.0.0.0, class B is 255.255.0.0 and class C is 255.255.255.0. For
example, if the IP address is 129.196.180.93, a class B address, a subnet mask
of 255.0.0.0 is not valid, because there are too few subnet mask bits set.
Default Gateway IP Address The default gateway IP address is the IP
address of a gateway (router) attached to the same network as the device.
When the device detects that a host PC is not on the same network (using the
network number), the data is sent through the gateway to reach the host PC.
14
Note