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A-7
Matrix 12800 Switchers • Ethernet Connection
PRELIMINARY
Deterining whether device are on the ae ubnet
To determine the subnet, the IP address of the local device is compared to the IP
address of the remote device (figure A-6). Each 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
address of the local and remote devices addresses are unmasked.
Unmasked octets are compared (indicated by ? in figure A-6).
• If the subnet mask octet contains the value 0, the related octets of the IP
addresses of the local and remote devices are masked.
Masked octets are not compared (indicated by X in figure A-6).
If the unmasked octets of the two IP addresses match (indicated by = in figure A-6)
(example 1), the two addresses are on the same subnet.
If the two unmasked fields do not match (indicated by ≠ in figure A-6) (example 2
and example 3), the addresses are not on the same subnet.
192.168.254.254
255.255.0.0 (?.?.X.X)
192.168.2.25
=.=.X.X — Match
(Same subnet) (Different subnet) (Different subnet)
Local IP Address:
Subnet Mask:
Remote IP Address:
Match?:
Example 1 Example 2
192.168.254.254
255.255.0.0 (?.?.X.X)
190.190.2.25
≠.≠.X.X — No match
Example 3
192.168.254.254
255.255.0.0 (?.?.X.X)
192.190.2.25
=.≠.X.X — No match
Figure A-6 — Comparing the IP addresses