Extron electronics DXP DVI Pro User Manual page 139

Determining whether devices are on the same subnet
To determine the subnet, the local device IP address is compared to the remote device IP
address (see figure 125). The octets of each address are compared or not, depending on
the value in the related subnet mask octet.
• If a subnet mask octet contains the value 255, the related octets of the local device
address and the remote device IP address are unmasked.
Unmasked octets are compared (indicated by ? in figure 125).
• If the subnet mask octet contains the value 0, the related octets of the local device and
remote device IP addresses are masked.
Masked octets are not compared (indicated by
If the unmasked octets of the two IP addresses match (indicated by = in example 1 of
figure 121), the two addresses are on the same subnet.
If the two unmasked fields do not match (indicated by an unequal sign in figure 125,
examples 2 and 3), the addresses are not on the same subnet.
Example 1
Local IP Address: 192.168.254.254
Subnet Mask: 255.255.0.0 (?.?.X.X)
Remote IP Address: 192.168.2.25
Match?: = . = .X.X — Match
(Same subnet)
Figure 125. Comparing the IP Addresses
DXP DVI Pro and DXP HDMI Series • Reference Information
in figure 125).
n
Example 2
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
(Different subnet) (Different subnet)
Example 3
= . ≠ .X.X — No match
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