Mobility Electronics PCI Expansion System P13RR-TEL - Manual (Page 29)

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Chapter 5 Remote Monitoring 21
Subnet Mask and Gateway Address
The subnet mask can be used to determine which network a particular
IP belongs to. It is helpful for dividing a host to many different subnets.
The gateway address is used to point Surveillance Pro 2 to the router
used to gain access to the Internet. If your DHCP server is configured to
assign DHCP clients with a gateway address simply enter a 0 in the
gateway address field. Otherwise, enter the appropriate value in the
field in dotted decimal format (an example of dotted decimal notation
would be 64.225.254.129).
If you entered a specific IP address in the IP Address field above,
you must also enter an IP address in the Subnet Mask and
Gateway Address fields. If you are using DHCP and used a 0 in
the IP Address field, enter a 0 into these fields.
The actual subnet mask and gateway address can be found by typing
ipconfig at the command prompt.