Flextronics Sales & Marketing Ltd. NC800-GW223R1 Manual Do Utilizador
Motorola Cellular Gateway NC800 User Guide Version 2.0
Page 40 of 110
o Disable – The Motorola Cellular Gateway NC800 does not assign IP addresses to computers on
the LAN. Select this setting if another DHCP server already exists on the network or if static IP
addresses are assigned. Please note that the Motorola Cellular Gateway NC800 itself must have a
statically assigned IP address because it is acting as a gateway to the LAN network, so its IP
address must be known and not change.
addresses are assigned. Please note that the Motorola Cellular Gateway NC800 itself must have a
statically assigned IP address because it is acting as a gateway to the LAN network, so its IP
address must be known and not change.
• LAN DHCP (only available if LAN DHCP Server is set to Enabled)
o DHCP Starting IP Address – Specifies the start of the address range that the DHCP server will
use, e.g. 192.168.1.100. The DHCP server will only assign IP addresses within the Start - End
range. IP addresses outside the range are assumed to be static IP addresses and can be used by
computers on the network that have a reserved IP address. The maximum number of IP addresses
that can be issued is 253. These addresses should fall within the address ranges reserved for
private Internets, unless the address range specified here has been assigned to you by IANA.
Please refer to the IP address structure entry in the glossary for more detail regarding the allowable
ranges.
range. IP addresses outside the range are assumed to be static IP addresses and can be used by
computers on the network that have a reserved IP address. The maximum number of IP addresses
that can be issued is 253. These addresses should fall within the address ranges reserved for
private Internets, unless the address range specified here has been assigned to you by IANA.
Please refer to the IP address structure entry in the glossary for more detail regarding the allowable
ranges.
o DHCP Ending IP Address – Specifies the end of the address range that the DHCP server will use,
e.g. 192.168.1.150.
o Lease Time – Specifies the number of seconds DHCP leases should be valid for. The maximum
lease time can be set to 86400 seconds. A short duration (e.g. 1 hour) is recommended if there are
more users than addresses. If users need to keep their addresses while the DHCP Server is
unavailable, then the duration should be set to longer than a possible DHCP Server outage. If it is
desirable to retain IP addresses even when devices are powered down, then the duration should be
set longer than any likely period of inactivity. See also the discussion in the section describing the
Gateway-> DHCP Leases screen.
more users than addresses. If users need to keep their addresses while the DHCP Server is
unavailable, then the duration should be set to longer than a possible DHCP Server outage. If it is
desirable to retain IP addresses even when devices are powered down, then the duration should be
set longer than any likely period of inactivity. See also the discussion in the section describing the
Gateway-> DHCP Leases screen.
• Secondary LAN IP Address – You have to assign a unique static IP address to the Motorola Cellular
Gateway NC800’s LAN 2 local interface. Being static, this IP address will not change and will be the
default Motorola Cellular Gateway NC800 address for all computers connecting to this Motorola Cellular
Gateway NC800 on the LAN 2 interface. The default IP address for this Motorola Cellular Gateway
NC800 is 192.168.2.1. The dotted-decimal notation must be used. The interested reader is referred to
the glossary for more detailed information on IP addressing and subnet masks. The LAN 2 interface is
the wired Ethernet port on the back panel labeled LAN 2.
default Motorola Cellular Gateway NC800 address for all computers connecting to this Motorola Cellular
Gateway NC800 on the LAN 2 interface. The default IP address for this Motorola Cellular Gateway
NC800 is 192.168.2.1. The dotted-decimal notation must be used. The interested reader is referred to
the glossary for more detailed information on IP addressing and subnet masks. The LAN 2 interface is
the wired Ethernet port on the back panel labeled LAN 2.
• Secondary LAN Subnet Mask – IP network mask of the Motorola Cellular Gateway NC800 on the LAN
2 interface, e.g. 255.255.255.0. If you are intentionally using a different subnet mask on your local
network, enter the appropriate subnet mask. The dotted-decimal notation must be used. The interested
reader is referred to the glossary for more detailed information on IP addressing and subnet masks.
network, enter the appropriate subnet mask. The dotted-decimal notation must be used. The interested
reader is referred to the glossary for more detailed information on IP addressing and subnet masks.
Gateway-> DHCP Leases
The Motorola Cellular Gateway NC800 is acting as a DHCP server if it automatically assigns IP addresses to
the computers connecting to it. The Motorola Cellular Gateway NC800 builds up a table of MAC addresses and
the IP address assigned to it. In a sense, a MAC address is “leasing” an IP address for a period of time. The
computer requesting an IP address from the Motorola Cellular Gateway NC800 will periodically “renew” the IP
address. The Motorola Cellular Gateway NC800 will then re-assign an IP address to it – in most cases this will
be the same address that was assigned to the computer previously.
If the computer does not renew its IP lease then the DHCP lease will expire. The Motorola Cellular Gateway
NC800 is then free to re-assign the IP address to the next computer requesting an IP address.
the computers connecting to it. The Motorola Cellular Gateway NC800 builds up a table of MAC addresses and
the IP address assigned to it. In a sense, a MAC address is “leasing” an IP address for a period of time. The
computer requesting an IP address from the Motorola Cellular Gateway NC800 will periodically “renew” the IP
address. The Motorola Cellular Gateway NC800 will then re-assign an IP address to it – in most cases this will
be the same address that was assigned to the computer previously.
If the computer does not renew its IP lease then the DHCP lease will expire. The Motorola Cellular Gateway
NC800 is then free to re-assign the IP address to the next computer requesting an IP address.
The DHCP leases page displays the current DHCP leases table. This page is for information only. No
values can be set on this page. In order to change DHCP related fields you need to go to the Gateway
-> LAN Interface page.
values can be set on this page. In order to change DHCP related fields you need to go to the Gateway
-> LAN Interface page.