Gigaset SE105 Owner's Manual page 70

LAN IP
If you want to assign the router a different IP address, enter it in IP address.
N
We recommend using an address from the block that is reserved for
i
private use. This is the address block 192.168.0.0 - 192.168.255.254.
If the DHCP server is active, you will have to specify a
N
the period of time in which the PCs retain the IP address assigned to them without
changing them. For small networks you can set Lease time to Forever. This means
that an IP address is assigned for an unlimited period of time.
IP address pool
In IP address pool enter the range of IP addresses that the router is to use for
automatically assigning IP addresses to the PCs.
Enter the first and last addresses.
N
The first three fields of the beginning and end IP address always have
as their default setting the first three fields of the router's IP address
i
because the subnet mask is always 255.255.255.0. This means that
the first three address segments for all network components must be
identical.
To apply the settings click on APPLY.
N
Configuration with Advanced Setup
Lease time. Lease Time defines
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