Determining Whether Devices Are On The Same Subnet - Extron electronics XTP CrossPoint1600 User Manual

Determining Whether Devices Are on the Same Subnet

To determine the subnet, the IP address of the analog device is compared to the IP address
of the remote device (see figure 85). The octets of each address are compared or not
compared, depending on the value in the related subnet mask octet.
If a subnet mask octet contains the value 255, the related octets of the IP addresses of
•
the analog device and the remote device are unmasked.
Unmasked octets are compared (indicated by
If the subnet mask octet contains the value 0, the related octets of the IP addresses of
•
the analog device and remote device are masked.
Masked octets are not compared (indicated by
If the unmasked octets of the two IP addresses match (indicated by
the two addresses are on the same subnet.
If the two unmasked fields do not match (indicated by
example 3), the addresses are not on the same subnet.
Local IP Address:
Subnet Mask:
Remote IP Address:
Figure 85.
Example 1
192.168.254.254
255.255.0.0 (?.?.X.X)
192.168.2.25
Match?: =.=.X.X — Match
subnet)
(Same
Comparing the IP Addresses of the Analog and Remote Devices
? in figure 85).
X
in figure 85).
=
≠ in figure 85, example 2 and
Example 2 Example 3
192.168.254.254 192.168.254.254
255.255.0.0 (?.?.X.X) 255.255.0.0 (?.?.X.X)
190.190.2.25 192.190.2.25
≠.≠.X.X
— No match =.≠.X.X
subnet)
(Different (Different
XTP CrossPoint Series • Ethernet Connection
in figure 85, example 1),
— No match
subnet)
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