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The Configuration Tree Functions The System Configuration Menu - Page 33
Addressing on the Local Subnet
Before completing the System Configuration menu, the operation of the local
subnet must be considered. This may consist entirely of the devices connected to
the IPNC via a hub, with the IPNC handling all addressing as a Dynamic Host
Configuration Protocol (DHCP ) server. In this case, the configuration is minimal.
In other cases, the IPNC may be connected to an external hub or router and
hence is part of a larger network that may use either dynamic or static
addressing.
CAUTION: It is critical to set up all IP addresses correctly to avoid contention.
A DHCP server assigns IP addresses to clients automatically as they boot up on
a TCP/IP network. In default, when started, the IPNC sends a request for a
DHCP address to the local network. If none is received, the IPNC assumes the
role of a DHCP server and manages all addressing for both LAN devices and
dial-in users. When operating as a DHCP server the IPNC uses it's own address
as the starting address from which it will allocate new addresses to registering
devices. See DHCP mode selection in The LAN1/2 Tab on page 35. If the IPNC
is configured as part of an existing subnet that already uses another DHCP
server, the mode can be set to Client, in order to leave control of the addressing
with the existing server.
Note: On start up, the IPNC automatically becomes a client if it receives an
address, e.g. if the IPNC finds a DHCP server already present on the
network.
The DHCP mode can be also set to Dial In. In this mode, the IPNC manages
DHCP addressing for users with dialled access whilst the existing server
manages addressing on the subnet. Addresses are allocated to dial-in users as
they log on in the usual way, but the maximum number of addresses allowed
must be specified.
WARNINGS
1. IP addresses must not be in a range used by other DHCP servers.
2. In order for the IPNC's DHCP detection status to operate correctly,
the IPNC must be connected to the LAN BEFORE being powered up
(inserted into the INDeX). If this is not done there is the potential of
having TWO DHCPs on the same LAN!
If the lLocal network uses static IP addressing, DHCP must be either set to Dial
In or Disabled. In this case, the system must be given an IP address within the
local subnet range and not in use elsewhere on the network. The addresses for
dial-in users follow in sequence from the IPNC’s allocated address. For example,
if the current subnet address range ends at 123.234.21.10:
– 123.234.21.11 - Is the address of the IPNC
– 123.234.21.12 - Is the first address given to a dial-in user
– 123.234.21.13 - Is the second address given to a dial-in user, and so on.
INDeX IPNC Cassette Administration Manual The Configuration Tree Functions - Page 33
38DHB0002UKDD – Issue 7 (22/11/02) The System Configuration Menu