PRO208V-5k75 Installation and Safety Manual
900-0203-01-00 Rev B
31
Accessing the Gateway from Outside the Local Network — LAN-side configuration
DHCP has a lease time after which it requests renewal. This is problematic if it ends up with a different IP
address. A method must be used to make the IP address stay fixed. These methods include:
i)
Keep the Gateway in DHCP mode but force the router to allocate the same IP address each time. If
this is supported by the router it is generally the most desirable option.
ii)
Change to a fixed IP address.
Router capabilities and user interfaces vary. This example uses a particular Cisco router.
Ideally the Gateway would be left in DHCP mode, and the router configured to keep assigning the same
address. If this functionality is supported by the router it might look like Figure 32. In the figure it is labeled
DHCP Reservation
.
As can be seen in the above screenshot, the router has a defined range of 50 IP addresses it has reserved for
DHCP allocation, between 100 to 149 for the last field in the address. The
DHCP Reservation
screen allows
examination of the currently logged on devices, and the option of assigning an address in the allowed range
to the Gateway. Alternatively, an address can be assigned outside the DHCP range but the Gateway must also
be configured.
The screenshot of Figure 33 shows the DHCP reservation screen. In this example an address is assigned
outside the range (ending in “37”).
Figure 32: DHCP
Reservation on the
example Cisco router
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